synsacrum

US:USA pronunciation: respellingUSA pronunciation: respelling(sin sakrəm, -sākrəm)


WordReference Random House Unabridged Dictionary of American English © 2025
syn•sac•rum  (sin sakrəm, -sākrəm),USA pronunciation n., pl. -sac•ra (-sakrə, -sākrə).USA pronunciation [Ornith.]
  1. Birdsa dorsal ridge of bone in the pelvic region of birds, formed by the fusion of certain thoracic, lumbar, sacral, and caudal vertebrae.
  • syn- + sacrum 1900–05
syn•sacral, adj. 


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