Soil or media containing calcium carbonate; a soil alkaline in reaction because of the presence or calcium carbonate
Merriam-Webster Online Dictionarycalcareous (adjective)
a) resembling or carbonate especially in hardness - calcite calcium
b) consisting of or containing calcium carbonate , also containing calcium
growing on limestone or in soil impregnated with lime
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Calcareous is an adjective meaning "mostly or partly composed of calcium carbonate", in other words, containing lime or being chalky. The term is used in a wide variety of scientific disciplines.