-cardium

a combining form occurring in compounds that denote tissue or organs associated with the heart, as specified by the initial element: myocardium; pericardium.

Origin of -cardium

Probably generalized from pericardium

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

The rock was a baked sandstone; in the pebbles of the creek I found the impressions of bivalves (one ribbed like Cardium).
Journal of an Overland Expedition in Australia | Ludwig Leichhardt
They chiefly consist of the cardium edule, which appear to abound in the kitchen-middens of the Pas-de-Calais.
Primitive Man | Louis Figuier
In Unio, Cardium, and Hyria, the foot is large and not byssiferous.
The Ocean World: | Louis Figuier
To that era belong the deep beds of oyster shells and Cardium edule, which are still found at the bottom of the fjord.
Man and Nature | George P. Marsh
No mention is made of lateral teeth: was it then a veritable Cardium?
The Journal of the Proceedings of the Linnean Society - Vol. 4 | Various

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