PROVITAMIN A

I. (noun)

Meaning:

An orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver

Synonyms:

carotene; carotin; provitamin A

Classified under:

Nouns denoting substances

Hypernyms ("provitamin A" is a kind of...):

provitamin (vitamin precursor; a substance that is converted into a vitamin in animal tissues)

Hyponyms (each of the following is a kind of "provitamin A"):

beta-carotene (an isomer of carotene that is found in dark green and dark yellow fruits and vegetables)