Etymology
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calcareous (adj.)

also calcarious, "of the nature of lime, containing lime, chalky," 1670s, from Latin calcarius "of lime, pertaining to lime," from calx (genitive calcis) "lime, limestone" (see chalk (n.)).

The spelling in -eous, which appeared about 1790, is erroneous, influenced by words in -eous from Latin -eus. The etymological sense of calcar-eous would be 'of the nature of a spur.' [OED]

updated on September 25, 2018

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Definitions of calcareous from WordNet

calcareous (adj.)
composed of or containing or resembling calcium carbonate or calcite or chalk;
Synonyms: chalky
From wordnet.princeton.edu, not affiliated with etymonline.