Definition of vestigial
1 of a body part or organ : remaining in a form that is small or imperfectly developed and not able to function : being or having the form of a vestige (see vestige sense 2) a vestigial tail Kiwis lack an external tail, and their vestigial wings are entirely hidden beneath a curious plumage—shaggy, more like fur than feathers …— Stephen Jay Gould
2 : remaining as the last small part of something that existed before It's held in the Gold Room, a vestigial ballroom of the kind that every downtown hotel uses for banquets and conventions.— William Zinsser Later colonial laws … prohibited even speaking the Pequot language, now long dead but for a few vestigial words.— Kirk Johnson
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