wedgelike

1. Shaped like a wedge.
   • 1749, [John Cleland], “(Please specify the letter or volume)”, in Memoirs of a Woman of Pleasure [Fanny Hill], London: Printed [by Thomas Parker] for G. Fenton [i.e., Fenton and Ralph Griffiths] […], OCLC 731622352 ↗:

     He looks, he feels, and satisfies himself: the driving forward with fury, its prodigious stiffness, thus impacted, wedgelike, breaks the union of those parts, and gain'd him just the insertion of the tip of it, lip-deep; which being sensible of, he improved his advantage, and following well his stroke, in a straight line, forcibly deepens his penetration

• cuneiform
• wedgy