noun. In conchology, the hinge of a bivalve shell.

noun. In entomology, the basal joint of the maxilla, a narrow transverse piece, articulating with the lower side of the head.

noun. In Myriapoda, the distal or exterior one of two pieces of which the protomala or so-called mandible consists, the other piece being the stipes. See ṗrotomala, and cut under epilabrum. A. S. Packard.

noun. In the pelecypod mollusks, the primitive hinge: contrasted with the articulus or adult hinge.

noun. One of the two intersecting central streets of the Roman military camp or castrum, the other being the decumanus. A similar arrangement is found in the prehistoric pile-settlements of northern Italy.

noun. The basal joint of the maxilla in insects.

noun. The hinge of a bivalve shell.

"The term cardo means a hinge, that on which a thing turns, its principal point; and from this St. Thomas derives the various significations of the virtues as cardinal, whether in the generic sense, inasmuch as they are the common qualities of all other moral virtues, or in the specific sense, inasmuch as each has a distinct formal object determining its nature."

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