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Webster 1913 Edition

Adj.

[L.

caementitius

pertaining to quarry stones. See

Noun.

]

Of the nature of cement.

[R.]

Forsyth.

Adj.

Having the quality of cementing.

cementitious ‎(comparative more cementitious, superlative most cementitious)

Resembling or having some properties of cement.
(Can we find and add a quotation of Forsyth to this entry?)