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The following 2 entries include the term 5/ALPHA.
5-alpha-reductase
noun: an enzyme that catalyzes the conversion of testosterone to dihydrotestosterone
5-alpha-reductase deficiency
noun: a genetic disorder in which males exhibit external genitalia that typically resembles that of females but in which some secondary sex characteristics (such as an increase in muscle mass and descending of the testes) develop during puberty
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Merriam-Webster unabridged