vi·nyl ( P ) Pronunciation Key (vnl) n.

1. The univalent chemical radical CH2CH, derived from ethylene.
2. Any of various compounds containing the vinyl radical, typically highly reactive, easily polymerized, and used as basic materials for plastics.
3. Any of various typically tough, flexible, shiny plastics, often used for coverings and clothing.
4. Phonograph records considered as a group: a secondhand store that buys and sells vinyl.

Idiom:
"on vinyl"
In the medium of phonograph recordings: an old song available only on vinyl.