[awr-nuh-theen] /ˈɔr nəˌθin/
an amino acid, H 2 N(CH 2) 3 CH(NH 2)COOH, obtained by the hydrolysis of arginine and occurring as an intermediate compound in the urea cycle of mammals.
an amino acid produced from arginine by hydrolysis: involved in the formation of urea in the liver; diaminopentanoic acid. Formula: NH2(CH2)3CHNH2COOH
ornithine or·ni·thine (ôr’nə-thēn’)
Abbr. Orn An amino acid formed by the hydrolysis of arginine and important in the formation of urea.
An amino acid not found in proteins, formed by hydrolyzing arginine and important in the formation of urea. Chemical formula: C5H12N2O2.
[awr-nith-ik] /ɔrˈnɪθ ɪk/ adjective 1. of or relating to birds. /ɔːˈnɪθɪk/ adjective 1. of or relating to birds or a bird fauna
ornithinuria or·ni·thi·nu·ri·a (ôr’nə-thĭ-nur’ē-ə, -nyur’-) n. Excessive amounts of ornithine in the urine.
[awr-nuh-this-kee-uh n] /ˌɔr nəˈθɪs ki ən/ noun 1. any herbivorous dinosaur of the order Ornithischia, having a pelvis resembling that of a bird. Compare . adjective 2. belonging or pertaining to the Ornithischia. /ˌɔːnɪˈθɪskɪən/ adjective 1. of, relating to, or belonging to the Ornithischia, an order of dinosaurs that included the ornithopods, stegosaurs, ankylosaurs, and […]
1. a combining form meaning “bird,” used in the formation of compound words: ornithology. combining form 1. bird or birds: ornithology, ornithomancy, ornithopter, ornithoscopy, ornithosis before vowels ornith-, word-forming element meaning “bird, birds,” from comb. form of Greek ornis (genitive ornithos) “a bird” (in Attic generally “domestic fowl”), often added to the specific name of […]