A sound or motion that zooms.

Alternative form of root and branch

(astronomy, historical) A scientific instrument used to determine the orbital periods of Jupiter's moons and to compute the times of their eclipses.

(pharmacology) 2-chloro-1,1,2,-trifluoroethyl-difluoromethyl ether, a halogenated ether and structural isomer of isoflurane commonly used for inhalational anesthesia during the 1970s and 1980s.