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n.1.(Zool.) One of the excurrent apertures of sponges.
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Furthermore, 3 months after the beginning of the experiment, the half-cores with lower ectosome were covered by a collagenous, non-cellularized layer that remained white and formed no osculum; the half-cores with the upper ectosome produced a new oscule in 12-15 weeks and showed a normal pinacoderm periorated by pores.