|1.||[ adjective ] (used of opinions and actions) far beyond the norm|
"extremist political views" "radical opinions on education" "an ultra conservative"
|2.||[ noun ] (chemistry) two or more atoms bound together as a single unit and forming part of a molecule|
|Related terms:||substance unit methylene_group nitrate vinyl carboxyl cyano_group benzoyl_group hydroxyl uranyl alkyl allyl nitrite azo_group nitro_group acetyl azido_group glyceryl cacodyl propyl Butyl hydrazo_group ketone_group acyl alcohol_group aldehyde_group chromophore amino_group carbonyl_group benzyl molecule chemistry|
|3.||[ adjective ] (politics) markedly new or introducing radical change|
"a revolutionary discovery" "radical political views"
|4.||[ noun ] (chemistry,physics) 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 damage cells"
|5.||[ noun ] (politics) a person who has radical ideas or opinions|
|Related terms:||person disputant anarchist Bolshevik terrorist trot Young_Turk revolutionist leveler wobbly extremist|
|6.||[ adjective ] arising from or going to the root|
"a radical flaw in the plan"
|7.||[ adjective ] (linguistics) of or relating to or constituting a linguistic root|
"a radical verb form"
|Related terms:||linguistics root|
|8.||[ noun ] (mathematics) a sign placed in front of an expression to denote that a root is to be extracted|
|9.||[ adjective ] (botany) 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"
|Related terms:||cauline botany|
|10.||[ noun ] (linguistics) a character conveying the lexical meaning of a logogram|
|Related terms:||character ideogram|
|11.||[ noun ] (linguistics) the form of a word after all affixes are removed|
|Synonyms:||stem root theme base root_word|
"thematic vowels are part of the stem"
|Related terms:||form linguistics|