ornithine[ôr′nə t̸hēn′, -t̸hin]
a nonessential amino acid, NH(CH)CH(NH)COOH, found in animals as a product of urea formation from proteins and in the excrement of birds
Origin of ornithine; from Classical Greek ornis, bird (see ornitho-) + -ine
An amino acid, C5H12N2O2, not found in proteins, formed by hydrolyzing arginine and important in the formation of urea.
Origin of ornithineornith(uric acid), an acid found in birds' urine (ornith(o)– + uric acid) + –ine2.