What does nocturnal penile tumescence mean?

Word Pronunciation & Dictionary

nocturnal penile tumescence

Word Rarity Very rare

Frequency: Zipf frequency 1.47 in modern English

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noun

nocturnal penile tumescences (plural) NPT (alternative, initialism)

morning wood

What does nocturnal penile tumescence mean?: An erection during sleep or on waking up.

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