lutein
- n yellow carotenoid pigments in plants and animal fats and egg yolks
luteinizing hormone
- n a gonadotropic hormone that is secreted by the anterior pituitary; stimulates ovulation in female mammals and stimulates androgen release in male mammals
luteotropin
- n gonadotropic hormone secreted by the anterior pituitary; in females it stimulates growth of the mammary glands and lactation after parturition
lutetium
- n a trivalent metallic element of the rare earth group; usually occurs in association with yttrium