Definition of osculum in English:

osculum

Syllabification: os·cu·lum
Pronunciation: /ˈäskyələm
 
/

noun (plural oscula /-lə/)

Zoology
A large aperture in a sponge through which water is expelled.
More example sentences
  • Sponges will react by closing ostia or oscula, either because of direct physical stimulation or when suspended particles within the sponge are too large or highly concentrated.
  • In budding, aggregates of cells differentiate into small sponges that are released superficially or expelled through the oscula.
  • The hole closes and it is not until some days later that the sponge forms an osculum at its apical pole.

Origin

early 17th century: from Latin, 'little mouth'.

Definition of osculum in:

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