A surname.

Someone who is an expert in an area. / Someone who is employed or holds a position in an area. / Someone who has special characteristics relating to a topic or area.

A particular progestin and androgen/anabolic steroid: 17α-methyl-19-nortestosterone.

(organic chemistry) The zwitterion (2S)-3-(1H-imidazol-4-yl)-2-(trimethylammonio)propanoate related to histidine