Definitions

1. adjective

relating to or affecting the eye or vision

“The oscular condition of her eyes was a cause for concern.”

2. noun

a part of an organism that is involved in vision, especially in molluscs

“The oscular tentacle of the octopus sensed its surroundings.”

3. noun

a structure, especially in certain types of sponges, that serves as an entrance or opening

“The osculum of the sponge filtered the water for nutrients.”