From Latin calcārius (“of or pertaining to lime”), derived from calx (“lime”). Similar to calcium.
calcareous (comparative more calcareous, superlative most calcareous)
- Resembling or containing calcium carbonate or limestone; chalky.
1891, Thomas Hardy, Tess of the d'Urbervilles, volume 1, London: James R. Osgood, McIlvaine and Co., page 15:
The traveller from the coast, who, after plodding northward for a score of miles over calcareous downs and corn-lands, suddenly reaches the verge of one of these escarpments[.]
resembling or containing limestone