A duct or channel that is located on the back or dorsal side of an organism, or a duct that carries substances in a back-directed path.
From 'dorsi-' (back) combined with 'duct' from Latin 'ductus' (led/drawn). Describes any tubular structure positioned or functioning on the dorsal surface.
Some fish have dorsiducts that carry secretions along their back surfaces—these specialized channels have evolved to deliver antimicrobial compounds that protect scales from infection!
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