The Collaborative International Dictionary of English v.0.48:

Giblets \Gib"lets\, n. pl. [OE. gibelet, OF. gibelet game: cf.
   F. gibelotte stewed rabbit. Cf. Gibbier.]
   The inmeats, or edible viscera (heart, gizzard, liver, etc.),
   of poultry.
   [1913 Webster]

WordNet (r) 3.0 (2006):

giblets
    n 1: edible viscera of a fowl [syn: giblet, giblets]

Moby Thesaurus II by Grady Ward, 1.0:

63 Moby Thesaurus words for "giblets":
   abatis, abdomen, anus, appendix, blind gut, bowels, brain, brains,
   breast, cecum, chicken foot, chitterlings, cockscomb, colon,
   dark meat, drumstick, duodenum, foregut, gizzard, guts, haslet,
   heart, hindgut, innards, inner mechanism, insides, internals,
   intestine, inwards, jejunum, kidney, kidneys, kishkes,
   large intestine, leg, liver, liver and lights, lung, marrow,
   midgut, neck, oyster, perineum, pump, pylorus, rectum,
   small intestine, spleen, stomach, sweetbread, thigh, ticker,
   tongue, tripe, tripes, turkey foot, vermiform appendix, viscera,
   vitals, white meat, wing, wishbone, works