Zoology of sponges, having both canals, prosodal (of entrance) and aphodal (of exit) well developed. [ < diplo-comb. form + ancient Greek ὁδός way (see -odecomb. form2) + -alsuffix1.]
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1887 W. J. Sollas in Encycl. Brit. XXII. 415/1 This, which from the marked presence of both prosodal and aphodal canals may be termed the diplodal type of the Rhagon canal system, occurs but rarely.