osculum

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osculum

 [os´ku-lum]
a minute opening.

os·cu·lum

, pl.

os·cu·la

(os'kyū-lŭm, -lă),
A pore or minute opening.
[L. dim. of os, mouth]

os·cu·lum

, pl. oscula (os'kyū-lŭm, -lă)
A pore or minute opening.
[L. dim. of os, mouth]

osculum

the large aperture in sponges through which water passes out.
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Water was slowly drawn from the inhalant stream at a distance of ~3-5 cm from the sponge ostia and then from the exhalant water inside the oscular aperture; care was taken to avoid contact with the sponge, and one syringe was used per specimen.