also  ca*rot*in*oid  n :  any of various usu. yellow to red pigments (as carotenes) found widely in plants and animals and characterized chemically by a long aliphatic polyene chain composed of eight isoprene units carotenoid adj 
 
 
 
Similar sounding terms:  carotinoid  co·or·di·nate  cre·tin·oid  gra·di·ent 
 
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