a unifying idea that is a recurrent element in a literary or artistic work; "it was the usual `boy gets girl' theme"
(music) melodic subject of a musical composition; "the theme is announced in the first measures"; "the accompanist picked up the idea and elaborated it"
provide with a particular theme or motive; "the restaurant often themes its menus"
air passage provided by a retractable device containing intake and exhaust pipes; permits a submarine to stay submerged for extended periods of time
breathing device consisting of a bent tube fitting into a swimmer's mouth and extending above the surface; allows swimmer to breathe while face down in the water