Goatee

google

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early 19th century: so named because of its resemblance to the tuft on a goat's chin.

wiktionary

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From goat +‎ -ee(diminutive suffix).

etymonline

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goatee (n.)

"pointed tuft of beard on the chin of a shaven face," 1844 (as goaty; current spelling by 1847), from goaty (adj.). So called from its resemblance to a male goat's chin hairs.