opisthure Ichthyol.
(ˈɒpɪsθjʊə(r))
[f. opistho- + Gr. οὐρά tail.]
The posterior end of the caudal axis in the embryonic stage of some fishes, which is ultimately absorbed into the caudal fin. Hence opisˈthural a., pertaining to the opisthure.
| 1891 Cent. Dict. cites J. A. Ryder. |