| AC | a vein formed by the union of the 4th to 7th posterior intercostal veins |
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| AC | a vein formed by the union of the 4th to 7th posterior intercostal veins |
| AC | arises from two sets of roots (cranial and spinal) that unite to form the accessory nerve trunk |
| AC | a vein that accompanies the vertebral vein but passes through the foramen of the transverse process of the 7th cervical vertebra and empties into the brachiocephalic vein |
| AC | a town and port in northwestern Israel in the eastern Mediterranean |
| AC | an embellishing note usually written in smaller size |
| AC | the part of grammar that deals with the inflections of words |
| AC | anything that happens by chance without an apparent cause |
| AC | a mishap |
| AC | the branch of medicine that deals with the surgical repair of injuries and wounds arising from accidents |
| AC | having more than the average number of accidents |
| AC | a musical notation that makes a note sharp or flat or natural although that is not part of the key signature |