oscula-

(Latin: kiss; from "little mouth"; lip [diminutive of os-, "mouth"])

oscule (s) (noun), oscules (pl)
The mouthlike opening of a sea sponge which is used to expel water.
osculum (s) (noun), oscula (pl)
1. An opening like a mouth, through which a sponge expels water.
2. A minute opening.

Other "kissing" words: philema-.