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| one member of the two lowest pairs of ribs, which are attached neither to the sternum nor to the cartilages of other ribs. |
| a large, triangular muscle covering the joint of the shoulder, the action of which raises the arm away from the side of the body |
| tympanic bone | |
| —n | |
| the part of the temporal bone in the mammalian skull that surrounds the auditory canal | |
tympanic bone n.
The bony ring in the fetus that develops after birth into the tympanic part of the temporal bone of the skull, partially enclosing the middle ear and supporting the eardrum. Also called tympanic ring.