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. 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.
  30. A root: a primitive word or letter: one who advocates radical reform: ( chem.) the base of a compound.
  31. A root; primitive word; one who advocates a fundamental change in principles of government.
  32. Original; rooted; implanted by nature; reaching to the principles; pertaining to radicals.
  33. Proceeding from or pertaining to the root; essential; fundamental.
  34. Thoroughgoing; unsparing; extreme.
  35. An extremist.
  36. The primitive part of a word; a root; radicle.
  37. A quantity of which the root is required.
  38. A small root.
  39. Pertaining to the root or origin; original; fundamental; implanted by nature; primitive; underived; proceeding immediately from the root.
  40. 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.
  41. 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.
  42. 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. 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
  4. 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
  5. 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
  6. 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
  7. 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
  8. The radical wing of the Democracy had now found its orator. – The United States Since The Civil War by Charles Ramsdell Lingley
  9. 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
  10. And there are few signs of a radical change for the better. – England and Germany by Emile Joseph Dillon
  11. They'll make a Radical of you among them, Lizzie. – The Eustace Diamonds by Anthony Trollope
  12. 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
  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. Gainsborough is not a bit of a radical. – A Red Wallflower by Susan Warner
  15. 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
  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. There are to follow certain radical changes in the realm of nature. – Quiet Talks about Jesus by S. D. Gordon