A preparation made from Mycobacterium paratuberculosis used as an allergen in cases of paratuberculosis (Johne's disease).

(idiomatic) A man who is infatuated with one or more theatrical actresses and who routinely lingers in and around theatres in an effort to meet and form relationships with the female(s) of his affection.

(slang, idiomatic) A condom.

(slang) A condom.

plural of johnny bag

(UK, historical) A Breton agricultural labourer who travelled through English cities selling onions from a bicycle.

Someone who travels by johnboat

plural of Johnson bar

A corrugated metal bar used to reinforce concrete. / A hand lever on various vehicles. / A lever-dolly (similar to a crowbar) for moving heavy apparatus.

plural of onion Johnny