American Dictionary of the English Language

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INTEG'UMENT, noun [Latin integumentum, intego, to cover; in and tego. See Deck.] That which naturally invests or covers another thing; but appropriately and chiefly, in anatomy, a covering which invests the body, as the skin, or a membrane that invests a particular part. The skin of seeds and the shells of crustaceous animals are denominated integuments.