Webster's English Dictionary

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dorsal

1. dor.sal \'do.r-s*l\ \-s*-le-\ aj [LL dorsalis, fr. L dorsum back] 1: 
   relating to or situated near or on the back esp. of an animal or of one  of 
   its parts 2: ABAXIAL  - dor.sal.ly av
2. dorsal n : a dorsally located part; esp : a thoracic vertebra