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cementum    
牙骨质

牙骨质

cementum
n 1: a specialized bony substance covering the root of a tooth
[synonym: {cementum}, {cement}]

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.
[1913 Webster]

3. The powder used in cementation. See {Cementation}, n., 2.
[1913 Webster]

4. Bond of union; that which unites firmly, as persons in
friendship, or men in society. "The cement of our love."
[1913 Webster]

5. (Anat.) The layer of bone investing the root and neck of a
tooth; -- called also {cementum}.
[1913 Webster]

{Hydraulic cement}. See under {Hydraulic}.
[1913 Webster]


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