- Of or pertaining to the genus Sylvia, or family Sylviidæ; being, related to, or resembling a member of the Sylviidæ; warbler-like. See warbler, Sylviidæ, Sylvicolidæ.
- One of the warblers; a member of the genus Sylvia or family Sylviidæ of the Old World, or
- of the family Mniotiltidæ of America. See these words, and warbler.
- Relating or named from the anatomist Jacques Dubois, Latinized Sylvius (1478–1555): specifically applied in anatomy to several parts.