The Collaborative International Dictionary of English v.0.48:
Carotin \Ca*ro"tin\, n. (Chem.) A red crystallizable tasteless substance, extracted from the carrot. [1913 Webster]WordNet (r) 3.0 (2006):
carotin n 1: an orange isomer of an unsaturated hydrocarbon found in many plants; is converted into vitamin A in the liver [syn: provitamin A, carotene, carotin]