One of the mysteries of the English language finally explained.
A testicle from a monkey or ape used as a possible means of rejuvenation, either by being grafted on to a man, or by the injection of an extract. Frequently in plural Also attributive (allusively).
Early 20th century; earliest use found in The Sheboygan Press. From monkey + gland.
monkey gland/ˈmʌŋkɪ ɡland/
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