posteriad adv. [L. post, after; -ad, toward] Directed backward, as opposed to anteriad.
posterior a. [L. posterior, latter] 1. Situated behind; behind the axis. 2. (MOLL: Bivalvia) Direction along the major axis in which the anus faces and the exhalant current flows.
posterior apophysis (ARTHRO: Insecta) In female Lepidoptera, sclerotized, paired apodemes of the 8th abdominal segment, extending cephalad and serving for muscle attachment; apophyses posteriores.
posterior area (MOLL: Bivalvia) Area on the surface of the valve posterior to the posterior ridge.
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