tyro

n. [ L. tirocinium first service or trial, fr. tiro. See Tyro. ] The state of being a tyro, or beginner; apprenticeship. [ Obs. ] Blount. [ 1913 Webster ]

n. [ From Tyrol, where it occurs. ] (Min.) A translucent mineral of a green color and pearly or vitreous luster. It is a hydrous arseniate of copper. [ 1913 Webster ]

n. The state of being a tyro, or beginner. [ Written also tironism. ] [ 1913 Webster ]

n. [ Gr. &unr_; cheese. ] (Physiol. Chem.) A white crystalline nitrogenous substance present in small amount in the pancreas and spleen, and formed in large quantity from the decomposition of proteid matter by various means, -- as by pancreatic digestion, by putrefaction as of cheese, by the action of boiling acids, etc. Chemically, it consists of oxyphenol and amidopropionic acid, and by decomposition yields oxybenzoic acid, or some other benzol derivative. [ Written also tyrosine. ] [ 1913 Webster ]

n. [ NL., fr. Gr. &unr_; cheese + &unr_;. See Toxic. ] (Physiol. Chem.) A ptomaine discovered by Vaughan in putrid cheese and other dairy products, and producing symptoms similar to cholera infantum. Chemically, it appears to be related to, or identical with, diazobenzol. [ 1913 Webster ]