From mid- + dorsal.
middorsal (not comparable)
- In the middle of a dorsal region
2015 July 23, “Phylogeny of Kinorhyncha Based on Morphology and Two Molecular Loci”, in PLOS ONE[1], →DOI:Neck and segment 1 of Semnoderes armiger in dorsal view, showing the deep middorsal incision in the anterior segment margin (arrow) (character 17, state 2).