Tongue-shaped adj. Shaped like a tongue; specifically (Bot.), linear or oblong, and fleshy, blunt at the end, and convex beneath; as, a tongue-shaped leaf.
... roughly drawn and hastily cut. In those early days a single "round" of wood was used—a "round" that had been cross-cut from the trunk of the tree. This was always kept seasoning until by natural shrinkage it had split up to the centre, when a tongue-shaped piece of box was fitted into the triangular vacancy and screwed firmly through. Then the block was squared as well as its shape permitted, and when its surface had been properly prepared, it was ... — The History of "Punch" • M. H. Spielmann