Webster dictionary was developed by Noah Webster in the beginning of 19th century. On this website, you can find definition for radical from the 1913 edition of Webster's Revised Unabridged Dictionary. Define radical using one of the most comprehensive free online dictionaries on the web.

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radical
Part of Speech: Noun
Results: 13
2. Belonging to, or proceeding from, the root of a plant; as, radical tubers or hairs.
3. 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.
5. Of or pertaining to a radix or root; as, a radical quantity; a radical sign. See below.
6. A radical vessel. See under Radical, a.
Part of Speech: noun
1. A primitive word; a radix, root, or simple, underived, uncompounded word; an etymon.
2. A primitive letter; a letter that belongs to the radix.
3. A characteristic, essential, and fundamental constituent of any compound; hence, sometimes, an atom.
4. A radical quantity. See under Radical, a.
5. One who advocates radical changes in government or social institutions, especially such changes as are intended to level class inequalities; - opposed to conservative.
7. 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.
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