Source : Webster's Revised Unabridged Dictionary (1913)

Carotin \Ca*ro"tin\, n. (Chem.)
   A red crystallizable tasteless substance, extracted from the
   carrot.

Source : WordNet®

carotin
     n : an orange isomer of an unsaturated hydrocarbon found in many
         plants; is converted into vitamin A in the liver [syn: {provitamin
         A}, {carotene}]