Definitions of radical

  1. ( linguistics) the form of a word after all affixes are removed; " thematic vowels are part of the stem"
  2. a person who has radical ideas or opinions
  3. A primitive word; a radix, root, or simple, underived, uncompounded word; an etymon.
  4. A primitive letter; a letter that belongs to the radix.
  5. A characteristic, essential, and fundamental constituent of any compound; hence, sometimes, an atom.
  6. A radical quantity. See under Radical, a.
  7. One who advocates radical changes in government or social institutions, especially such changes as are intended to level class inequalities; - opposed to conservative.
  8. A simple word, or root, from which other words are formed; a person who holds extreme views and takes extreme measures.
  9. Radicalness.
  10. A root: a primitive word or letter: one who advocates radical reform: ( chem.) the base of a compound.
  11. A root; primitive word; one who advocates a fundamental change in principles of government.
  12. An extremist.
  13. The primitive part of a word; a root; radicle.
  14. A quantity of which the root is required.
  15. 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.
  16. ( linguistics) of or relating to or constituting a linguistic root; " a radical verb form"
  17. arising from or going to the root; " a radical flaw in the plan"
  18. 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"
  19. Of or pertaining to the root; proceeding directly from the root.
  20. 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.
  21. Belonging to, or proceeding from, the root of a plant; as, radical tubers or hairs.
  22. 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.
  23. Relating, or belonging, to the root, or ultimate source of derivation; as, a radical verbal form.
  24. Of or pertaining to a radix or root; as, a radical quantity; a radical sign. See below.
  25. 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.
  26. A radical vessel. See under Radical, a.
  27. 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.
  28. 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.
  29. Original; rooted; implanted by nature; reaching to the principles; pertaining to radicals.
  30. Proceeding from or pertaining to the root; essential; fundamental.
  31. Thoroughgoing; unsparing; extreme.
  32. Pertaining to the root or origin; original; fundamental; implanted by nature; primitive; underived; proceeding immediately from the root.
  33. 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.
  34. Arising from the root close to the ground, as basal leaves.