• Radical Definition & Synonyms

  1. (a.) Of or pertaining to a radix or root; as, a radical quantity; a radical sign. See below.
  2. (a.) Of or pertaining to the root; proceeding directly from the root.
  3. (n.) A characteristic, essential, and fundamental constituent of any compound; hence, sometimes, an atom.
  4. (n.) A primitive letter; a letter that belongs to the radix.
  5. (a.) A radical vessel. See under Radical, a.
  6. (a.) 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.
  7. (n.) 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.
  8. (n.) A primitive word; a radix, root, or simple, underived, uncompounded word; an etymon.
  9. (a.) 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.
  10. (n.) A radical quantity. See under Radical, a.
  11. (a.) Relating, or belonging, to the root, or ultimate source of derivation; as, a radical verbal form.
  12. (a.) Belonging to, or proceeding from, the root of a plant; as, radical tubers or hairs.
  13. (n.) One who advocates radical changes in government or social institutions, especially such changes as are intended to level class inequalities; -- opposed to conservative.

Basal, Base, Extremist, Group, Revolutionary, Root, Stem, Theme, Ultra,

• Radicality Definition & Synonyms

  1. (n.) Radicalness; relation to a root in essential nature or principle.
  2. (n.) Germinal principle; source; origination.

• Radicalness Definition & Synonyms

  1. (n.) Quality or state of being radical.