carotenoid
Definition :
One of a class of tetraterpenoids (C40), formally derived from the acyclic parent, psi,psi-carotene by hydrogenation, dehydrogenation, cyclization, oxidation, or combination of these processes. This class includes carotenes, xanthophylls and certain compounds that arise from rearrangement of the skeleton of psi,psi-carotene or by loss of part of this structure. Retinoids are excluded.
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terpene
Definition :
A hydrocarbon of biological origin having carbon skeleton formally derived from isoprene [CH22C(CH3)CH2CH2].
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