a. Chiefly Zool. and Bot. [ad. mod.L. subtriangularis: see SUB- 20 e.] Approaching the form of a triangle; somewhat triangular.

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1787.  trans. Linnæus’ Fam. Plants, 763. Calodendron…. Seeds two in each cell, subtriangular.

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1824.  Du Bois, Lamarck’s Arrangem., 45. The Mactræ … are marine shells … almost always subtriangular.

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1854.  Owen, in Orr’s Circ. Sci., Org. Nat., I. 192. The exoccipitals … are very irregular subtriangular bones.

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1881.  Nature, XXIII. 605. A sub-triangular wedge-shaped implement.

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  So Subtriangulate a., with combining form Subtriangulato-.

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1849.  Hardy, in Proc. Berw. Nat. Club, II. vii. 361. Head sub-triangulate.

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1852.  Dana, Crust., I. 118. Carapax sub-triangulato-ovate.

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