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The Collaborative International Dictionary of English v.0.48 (gcide)

Cement \Ce*ment"\ (s[e^]*m[e^]nt" or s[e^]m"[e^]nt), n. [OF.
cement, ciment, F. ciment, fr. L. caementum a rough, unhewn
stone, pieces or chips of marble, from which mortar was made,
contr. fr. caedimentum, fr. caedere to cut, prob. akin to
scindere to cleave, and to E. shed, v. t.]
1. Any substance used for making bodies adhere to each other,
as mortar, glue, etc.
[1913 Webster]

2. A kind of calcined limestone, or a calcined mixture of
clay and lime, for making mortar which will harden under
water.
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3. The powder used in cementation. See {Cementation}, n., 2.
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4. Bond of union; that which unites firmly, as persons in
friendship, or men in society. "The cement of our love."
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5. (Anat.) The layer of bone investing the root and neck of a
tooth; -- called also {cementum}.
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{Hydraulic cement}. See under {Hydraulic}.
[1913 Webster]

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