Definitions of radical

  1. ( botany) especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root- like stem; " basal placentation"; " radical leaves"
  2. ( chemistry) two or more atoms bound together as a single unit and forming part of a molecule
  3. ( used of opinions and actions) far beyond the norm; " extremist political views"; " radical opinions on education"; " an ultra conservative"
  4. an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule than has lost an electron and will stabilize itself by stealing an electron from a nearby molecule; " in the body free radicals are high- energy particles that ricochet wildly and damage cells"
  5. ( linguistics) of or relating to or constituting a linguistic root; " a radical verb form"
  6. ( linguistics) the form of a word after all affixes are removed; " thematic vowels are part of the stem"
  7. a sign placed in front of an expression to denote that a root is to be extracted
  8. a person who has radical ideas or opinions
  9. markedly new or introducing radical change; " a revolutionary discovery"; " radical political views"
  10. arising from or going to the root; " a radical flaw in the plan"
  11. especially of leaves; located at the base of a plant or stem; especially arising directly from the root or rootstock or a root- like stem; " basal placentation"; " radical leaves"
  12. Of or pertaining to the root; proceeding directly from the root.
  13. Hence: Of or pertaining to the root or origin; reaching to the center, to the foundation, to the ultimate sources, to the principles, or the like; original; fundamental; thorough- going; unsparing; extreme; as, radical evils; radical reform; a radical party.
  14. Belonging to, or proceeding from, the root of a plant; as, radical tubers or hairs.
  15. Proceeding from a rootlike stem, or one which does not rise above the ground; as, the radical leaves of the dandelion and the sidesaddle flower.
  16. Relating, or belonging, to the root, or ultimate source of derivation; as, a radical verbal form.
  17. Of or pertaining to a radix or root; as, a radical quantity; a radical sign. See below.
  18. A primitive word; a radix, root, or simple, underived, uncompounded word; an etymon.
  19. A primitive letter; a letter that belongs to the radix.
  20. A characteristic, essential, and fundamental constituent of any compound; hence, sometimes, an atom.
  21. Specifically, a group of two or more atoms, not completely saturated, which are so linked that their union implies certain properties, and are conveniently regarded as playing the part of a single atom; a residue; -- called also a compound radical. Cf. Residue.
  22. A radical quantity. See under Radical, a.
  23. A radical vessel. See under Radical, a.
  24. One who advocates radical changes in government or social institutions, especially such changes as are intended to level class inequalities; - opposed to conservative.
  25. A simple word, or root, from which other words are formed; a person who holds extreme views and takes extreme measures.
  26. Pertaining to the root or origin; original; extreme; as, a radical difference of opinion; in mathematics, showing or containing the root of a number; pertaining to a political party of advanced views.
  27. Radically.
  28. Radicalness.
  29. 1. In chemistry, a group of atoms passing as such from one compound to another, acting thus like a single atom. 2. The haptophore group of an antibody. 3. Relating to the root or cause, thorough; as a radical operation, one which removes every trace of possibly diseased tissue, or makes recurrence impossible.
  30. A substance which admits combination with a simple body. Applied to active treatment for elimination of a diseased condition.
  31. Pertaining to the root, or origin: original: reaching to the principles: implanted by nature: not derived: serving to originate: ( bot.) proceeding immediately from the root: ( politics) ultra- liberal, democratic.
  32. A root: a primitive word or letter: one who advocates radical reform: ( chem.) the base of a compound.
  33. A root; primitive word; one who advocates a fundamental change in principles of government.
  34. Original; rooted; implanted by nature; reaching to the principles; pertaining to radicals.
  35. Proceeding from or pertaining to the root; essential; fundamental.
  36. Thoroughgoing; unsparing; extreme.
  37. An extremist.
  38. The primitive part of a word; a root; radicle.
  39. A quantity of which the root is required.
  40. A small root.
  41. Pertaining to the root or origin; original; fundamental; implanted by nature; primitive; underived; proceeding immediately from the root.
  42. A primitive word; a radix, root, or simple underived uncompounded word; a letter that belongs to the root; one who advocatea radical reform, or extreme changes of a democratic character in the state; the base of a compound. See Radix.
  43. Pert. to or arising from the root; fundamental; implanted by nature; constitutional; original; not derived or compounded; primitive; in bot., proceeding from a point close to the summit or crown of the root, applied to leaves close to the ground clustered at the base of a flower- stalk; complete; thorough.
  44. A root; in chem., the base or distinguishing part of a compound, whether itself a simple or compound; a primitive or uncompounded word or letter; a democrat or extreme politician.
  45. Arising from the root close to the ground, as basal leaves.

Usage examples for radical

  1. Such radical lines of treatment should be discouraged. – Common Diseases of Farm Animals by R. A. Craig, D. V. M.
  2. But the colonial secretary had obviously come to the opinion that it was necessary to make a radical change which would insure greater harmony between the executive and the popular bodies of the provinces. – Canada under British Rule 1760-1900 by John G. Bourinot
  3. They are not so radical as those who go by the same name in Germany, France, and other European countries. – Norwegian Life by Ethlyn T. Clough
  4. There are to follow certain radical changes in the realm of nature. – Quiet Talks about Jesus by S. D. Gordon
  5. But the honorable Senator thinks that I want to become a Radical. – History of the Thirty-Ninth Congress of the United States by Wiliam H. Barnes
  6. The radical wing of the Democracy had now found its orator. – The United States Since The Civil War by Charles Ramsdell Lingley
  7. And there are few signs of a radical change for the better. – England and Germany by Emile Joseph Dillon
  8. Able men the Scotch, a little too radical in politics, and a little too liberal, as it is called, in a matter of much greater consequence; but a superior people, on the whole. – The Attache or, Sam Slick in England, Complete by Thomas Chandler Haliburton
  9. But the radical impulse soon spent itself. – John Marshall and the Constitution A Chronicle of the Supreme Court, Volume 16 In The Chronicles Of America Series by Edward S. Corwin
  10. 94. And, in a note upon this passage, he adds: This is to be understood of primitive or radical terms. – The Grammar of English Grammars by Goold Brown
  11. Of course this meant a change in the established order of things that was both serious and radical. – The Facts of Reconstruction by John R. Lynch
  12. One of these is more radical and aggressive, the other has more the air of fighting a slow retreat. – Pragmatism A New Name for Some Old Ways of Thinking by William James
  13. The radical negro newspapers published here urged negroes to leave the South and promised employment and protection. – Negro Migration during the War by Emmett J. Scott
  14. They'll make a Radical of you among them, Lizzie. – The Eustace Diamonds by Anthony Trollope
  15. I recollected then, when it was too late, that Dodds is an advanced Radical and absolutely hates the idea of imperialism. – Lalage's Lovers 1911 by George A. Birmingham
  16. There were not loaves and fishes enough for the whole Radical party. – My First Years As A Frenchwoman, 1876-1879 by Mary King Waddington
  17. Gainsborough is not a bit of a radical. – A Red Wallflower by Susan Warner
  18. And it is possible that some radical alteration has taken place in Hugh Latimer's character, soul- whatever you choose to call that part of a man which controls his life- as a result of the operation. – Men, Women and Guns by H. C. (Herman Cyril) McNeile