|a printed punctuation mark (‽), available only in some typefaces, designed to combine the question mark (?) and the exclamation point (!), indicating a mixture of query and interjection, as after a rhetorical question.|
|a fool or simpleton; ninny.|
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.
|ornithine (ôr'nə-thēn') Pronunciation Key
An amino acid not found in proteins, formed by hydrolyzing arginine and important in the formation of urea. Chemical formula: C5H12N2O2.