Definitions

1. noun

A single animal or individual of a colonial or simple multicellular organism, especially a member of a colony of organisms such as a sponge or a coral.

“The zooid in the coral colony was responsible for producing food for the rest of the colony.”

2. noun

A self-contained unit of a multicellular organism that has a distinct function, such as a muscle or nerve cell.

“The zooid in the muscle tissue helped to contract and relax the muscle, enabling movement.”