l. the convex (excurvate) face of an artifact. 2. that face of an artifact which was furthest from the centre of the core from which it was manufactured. 3. of or pertaining to the back or spinal part of the body. 
Pertaining to the surface most distant from the axis; back of an outer face of organ; lower side of leaf; abaxial. Dorsal Side - Back or abaxial side, or the lower side of a perianth part