Definition of testicle in English:

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testicle

Pronunciation: /ˈtestək(ə)l/

noun

Either of the two oval organs that produce sperm in men and other male mammals, enclosed in the scrotum behind the penis. Also called testis.
Synonyms
testes, gonads
informal prairie oysters, mountain oysters, cojones, family jewels
vulgar slang balls, nuts, nads
British  bollocks

Origin

Late Middle English: from Latin testiculus, diminutive of testis 'a witness' (i.e., to virility).

More
  • The ancient Romans felt that a man's testicles testified that he was male. They formed the word testiculus from Latin testis ‘witness’, the source also of attest (late 16th century); detest (Late Middle English) which originally meant to denounce; protest (Late Middle English); testify (Late Middle English); and intestate (Late Middle English) ‘without a witnessed will’. The testicles were the ‘witnesses’ of the man's virility.

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