2 definitions found From WordNet (r) 2.0 [wn]: calcareous adjective: composed of or containing or resembling calcium carbonate or calcite or chalk [syn: {chalky}] From The Collaborative International Dictionary of English v.0.44 [gcide]: Calcareous \Cal*ca"re*ous\, adjective [L. calcarius pertaining to lime. See {Calx}.] Partaking of the nature of calcite or calcium carbonate; consisting of, or containing, calcium carbonate or carbonate of lime. {Calcareous spar}. See as {Calcite}.

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