provitamin

Noun
  1. Vitamin precursor;
    A substance that is converted into a vitamin in animal tissues (synset 115114946)
    is a type of: hydrocarbon - an organic compound containing only carbon and hydrogen
    subtypes: carotene, carotin, provitamin a - an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver

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