quadruplets

noun quadruplets

• quadrangle — a plane figure having four angles and four sides, as a square.
• quadrant — a quarter of a circle; an arc of 90°.
• quadruplet — any group or combination of four.
• quadraphonic — of, noting, or pertaining to the recording and reproduction of sound over four separate transmission or direct reproduction channels instead of the customary two of the stereo system: a quadraphonic recording.
• quadrivium — (during the Middle Ages) the more advanced division of the seven liberal arts, comprising arithmetic, geometry, astronomy, and music.