Pinfish \Pin"fish`\, n. [So called from their sharp dorsal spines.] (Zool.) (a) The sailor's choice ({Diplodus rhomboides} syn. {Lagodon rhomboides}). (b) The salt-water bream ({Diplodus Holbrooki}). [1913 Webster] Note: Both are excellent food fishes, common on the coast of the United States south of Cape Hatteras. The name is also applied to other allied species. [1913 Webster]