From The Collaborative International Dictionary of English v.0.44 [gcide]:
2. In New York City, the region which is the center of the night life of fashionable amusement, including the majority of the theaters, etc., centering on Broadway. The term orig. designates the old twenty-ninth police precinct, in this region, which afforded the police great opportunities for profit through conniving at vice and lawbreaking, one captain being reported to have said on being transferred there that whereas he had been eating chuck steak he would now eat tenderlion. Hence, in some other cities, a district largely devoted to night amusement, or, sometimes, to vice. [Webster 1913 Suppl.]
From WordNet (r) 2.0 [wn]:
From Moby Thesaurus II by Grady Ward, 1.0 [moby-thes]:
84 Moby Thesaurus words for "tenderloin": Bowery, Chateaubriand, Chinatown, East End, East Side, Little Hungary, Little Italy, West End, West Side, bagnio, barrio, bawdyhouse, black ghetto, blade roast, blighted area, bordello, breast, brisket, brothel, business district, cathouse, central city, chuck, chuck roast, city center, clod, cold cuts, core, crib, den, den of vice, disorderly house, dive, downtown, filet mignon, flank, ghetto, greenbelt, house of assignation, house of joy, house of prostitution, inner city, joint, knuckle, loin, midtown, outskirts, panel den, panel house, plate, plate piece, pot roast, rack, red-light district, residential district, rib roast, ribs, roast, rolled roast, round, rump, rump roast, run-down neighborhood, saddle, shank, shopping center, short ribs, shoulder, shoulder clod, sink of iniquity, sirloin, skid road, skid row, slum, slums, sporting house, stew, stews, suburbia, suburbs, tenement district, uptown, urban blight, whorehouse
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