FUNDAMENT

fundament. Fundament, n. the hinder part

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Fun″da‐ment (?), n. [[OE. fundament, fundement, fondement, OF. fundement, fondement, F. fondement, fr. L. fundamentum foundation, fr. fundare to lay the bottom, to found, fr. fundus bottom. See Fund.]] 1. 1. Foundation. Chaucer.
2. 2. The part of the body on which one sits; the buttocks; specifically (Anat.), the anus. Hume.