lateral tooth
noun
1Chiefly Zoology a tooth situated at or on the side of a structure or object.
2 Conchology and Palaeontology (in the shells of some bivalve molluscs) a projection, often flattened and elongated, towards either end of the hinge plate.
Origin
Mid 18th century; earliest use found in Benjamin Martin (bap. 1705, d. 1782), lecturer on science and maker of scientific instruments.