A kind of verse with a simple, song-like rhythm. / (colloquial, often childish) An informal gathering involving group singing.

Like a piece of sing-song; simple and melodic, song-like.

(physics, aerodynamics) The audible effect of a shock wave in the air, especially one caused by an aircraft flying faster than the speed of sound.

To produce such an effect.

(biochemistry, sometimes capitalized) A morphogenic protein that controls cell division of adult stem cells and has been implicated in the development of some cancers.

A book containing songs.

An event, often informal, where people sing together for the pleasure of it.

The property of being sonorous. / (linguistics, phonetics) Relative loudness (of a speech sound); degree of being sonorous.

A form of sonar that utilizes the Doppler effect to detect moving underwater objects; used especially by fishermen

Alternative spelling of plainsong