• (linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem"
• a sign placed in front of an expression to denote that a root is to be extracted
• a character conveying the lexical meaning of a logogram
• a person who has Radical ideas or opinions
• (chemistry) two or more atoms bound together as a single unit and forming part of a molecule
• 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 part
• 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"
• (used of opinions and actions) far beyond the norm; "extremist political views"; "Radical opinions on education"; "an ultra conservative"
• markedly new or introducing Radical change; "a revolutionary discovery"; "Radical political views"
• arising from or going to the root; "a Radical flaw in the plan"
• of or relating to or constituting a linguistic root; "a Radical verb form"

'Radical' in other languages