1. (chemistry) two or more atoms bound together as a single unit and forming part of a molecule (synset 114645624)
  2. 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 (synset 114898347)
    "in the body free radicals are high-energy particles that ricochet wildly and damage cells"
  3. A person who has radical ideas or opinions (synset 110523045)
  4. (mathematics) a quantity expressed as the root of another quantity (synset 113753670)
  5. A character conveying the lexical meaning of a logogram (synset 106854209)
  6. (linguistics) the form of a word after all affixes are removed (synset 106311183)
    "thematic vowels are part of the stem"
  1. (used of opinions and actions) far beyond the norm (synset 301539365)
    "extremist political views"; "radical opinions on education"; "an ultra conservative"
  2. Markedly new or introducing radical change (synset 301647099)
    "a revolutionary discovery"; "radical political views"
  3. Arising from or going to the root or source (synset 301862742)
    "a radical flaw in the plan"
  4. Of or relating to or constituting a linguistic root (synset 302847364)
    "a radical verb form"
  5. 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 (synset 300319565)
    "basal placentation"; "radical leaves"

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