(pharmacology) An alkaloid with the chemical formula C₂₀H₂₄N₂O₂ originally derived from cinchona bark (from plants of the genus Cinchona) used to treat malaria and as an ingredient of tonic water, which presents as a bitter colourless powder; also, a drug containing quinine or a chemical compound derived from it.

(transitive, archaic) To treat (someone) with quinine.

rapidity of movement or activity; agility or dexterity

Calcium oxide, which is produced by heating (calcining) limestone and gives slaked lime on treatment with water.

(transitive) To treat with quicklime.

(music) A composition (a type of chamber music) in five parts (typically each a singer or instrumentalist, sometimes several musicians)

The state of being quiescent; dormancy. / Being at rest, quiet, still, inactive or motionless.

To remain silent. / (idiomatic) To refrain from talking about something; to keep a secret.

Multiplied by five. / Being the fifth in a set of five.

A set of five similar or identical things. / One element of such a set.