Etymology
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testosterone (n.)

male sex hormone, 1935, from German Testosteron (1935), coined from a presumed combining form of Latin testis "testicle" (see testis) + first syllable of sterol + chemical ending -one.

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Definitions of testosterone

testosterone (n.)
a potent androgenic hormone produced chiefly by the testes; responsible for the development of male secondary sex characteristics;
From wordnet.princeton.edu