Definition, Meaning & Synonyms

placoid

Adjective

/ˈpleɪ.kɔɪd/

Definition

Referring to a type of scale found on certain fish, particularly cartilaginous fish like sharks and rays.

Examples

Sharks have placoid scales that help reduce drag as they swim through the water.
The placoid nature of the rays’ skin contributes to their unique texture and function.

Meaning

The term ‘placoid’ describes a specific kind of small scale that has a tooth-like structure, providing protection and aiding in the hydrodynamics of the fish.