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2 definitions found

From: DICT.TW English-Chinese Medical Dictionary 英漢醫學字典

 pro·at·las /-ˈætləs/ 名詞
 前寰椎

From: Webster's Revised Unabridged Dictionary (1913)

 Pro·at·las n.  Anat. A vertebral rudiment in front of the atlas in some reptiles.