· (chemistry) two or more atoms bound together as a single unit and forming part of a molecule

Synonym(s): group, chemical_group

Hypernym(s): unit, building_block

· an atom or group of atoms with at least one unpaired electron; in the body it is usually an oxygen molecule that has lost an electron and will stabilize itself by stealing an electron from a nearby molecule; "in the body free radicals are high-energy particles that ricochet wildly and damage cells"

Synonym(s): free_radical

Hypernym(s): atom

· a person who has radical ideas or opinions

Hypernym(s): person, individual, someone, somebody, mortal, soul

· (mathematics) a quantity expressed as the root of another quantity

Hypernym(s): measure, quantity, amount

· a character conveying the lexical meaning of a logogram

Hypernym(s): character, grapheme, graphic_symbol

· (linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem"

Synonym(s): root, root_word, base, stem, theme

Hypernym(s): form, word_form, signifier, descriptor

· (used of opinions and actions) far beyond the norm; "extremist political views"; "radical opinions on education"; "an ultra conservative"

Synonym(s): extremist, ultra

· markedly new or introducing radical change; "a revolutionary discovery"; "radical political views"

Synonym(s): revolutionary

· arising from or going to the root or source; "a radical flaw in the plan"

· of or relating to or constituting a linguistic root; "a radical verb form"

· 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"

Synonym(s): basal

Antonym(s): cauline