(music) A form of monophonic chant in unison using the Gregorian scale, sung in various Christian churches.

A native, inhabitant or settler of a plains region, but especially of the United States prairies

A police officer (especially a detective) who wears civilian clothes when on duty.

superlative form of plain: most plain

Synonym of plainsong

plural of plainsman

plural of plainclothes man

Alternative spelling of plainclothesman

plural of plainclothesman

plainclothes; wearing ordinary clothes instead of a uniform in order to avoid detection.