WordReference Random House Learner's Dictionary of American English © 2019
cau•li•flow•er /ˈkɔlɪˌflaʊɚ, ˈkɑlɪ-/USA pronunciation   n. 
  1. Plant Biology[countable] a form of a cultivated plant of the mustard family, with a compact, usually whitish head .
  2. Plant Biology[uncountable] the head of this plant, used as a vegetable.

WordReference Random House Unabridged Dictionary of American English © 2019
cau•li•flow•er  (kôlə flou′ər, -lē-, kolə-, kolē-),USA pronunciation n. 
  1. Plant Biologya form of cultivated plant, Brassica oleracea botrytis, of the mustard family, whose inflorescence forms a compact, usually whitish head. Cf. broccoli.
  2. Plant Biologythis head, used as a vegetable.
  • Latin flōri- (stem of flōs) flower
  • Italian ca(v)olfiore, equivalent. to cavol cole + fiore
  • Latin cauli(s) cole + flower; replacing coleflorie
  • 1590–1600

Collins Concise English Dictionary © HarperCollins Publishers::

cauliflower /ˈkɒlɪˌflaʊə/ n
  1. a variety of cabbage, Brassica oleracea botrytis, having a large edible head of crowded white flowers on a very short thick stem
  2. the flower head of this plant, used as a vegetable
Etymology: 16th Century: from Italian caoli fiori, literally: cabbage flowers, from cavolo cabbage (from Latin caulis) + fiore flower (from Latin flōs)

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