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integument (n.)

1610s, from Latin integumentum "a covering," from integere "to cover over," from in- "in, upon" (from PIE root *en "in") + tegere "to cover" (from PIE root *(s)teg- "to cover"). Specific sense in biology is from 1660s.

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Definitions of integument from WordNet

integument (n.)
an outer protective covering such as the skin of an animal or a cuticle or seed coat or rind or shell;
From wordnet.princeton.edu