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integument
In biology, integument is the natural covering of an organism or an organ, such as its skin, husk, shell, or rind.〔
It derives from ''integumentum'', which means "a covering" in Latin. In a transferred or figurative sense, it could mean a cloak or a disguise. In English "integument" is a fairly modern word, its origin having been traced back to the early seventeenth century. It can mean a material or layer with which anything is enclosed, clothed, or covered in the sense of "clad" or "coated", as with a skin or husk.
==Botanical usage==
In botany the senses are similar to those in zoology, referring to the covering of an organ, but when the context indicates nothing to the contrary, the word commonly refers to an envelope of one or more layers, each of two or more cell layers, covering the ovule, leaving only a pore, the micropyle, through which the pollen tube can enter. It may develop into the testa, or seed coat.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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