radical

1. a. Of or pertaining to the root; proceeding directly from the root. Source: opted

2. 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. Source: opted

3. a. Belonging to, or proceeding from, the root of a plant; as, radical tubers or hairs. Source: opted

4. 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. Source: opted

5. a. Relating, or belonging, to the root, or ultimate source of derivation; as, a radical verbal form. Source: opted

6. a. Of or pertaining to a radix or root; as, a radical quantity; a radical sign. See below. Source: opted

7. n. A word/primitive">primitive word; a radix, root, or simple, underived, uncompounded word; an etymon. Source: opted

8. n. A primitive letter; a letter that belongs to the radix. Source: opted

9. n. One who class="def-link" href="https://vividlex.com/word/advocates">advocates radical class="def-link" href="https://vividlex.com/word/changes">changes in government or social institutions, especially such changes as are intended to level class inequalities; -- opposed to conservative. Source: opted

10. n. A characteristic, essential, and fundamental constituent of any compound; hence, sometimes, an atom. Source: opted

11. 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. Source: opted

12. n. A radical quantity. See under Radical, a. Source: opted

13. a. A radical vessel. See under Radical, a. Source: opted

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