Relating to the back and inner surface, particularly used in describing structures in mollusks and other organisms.
From Latin 'dorsum' (back) + 'mesos' (middle/inner) with Latin suffix '-al'. Primarily used in comparative anatomy and zoology.
This term is especially useful in malacology (the study of mollusks) where shells and bodies have complex curves, and you need to describe exactly which part you mean.
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