S: (n) heat pump (apparatus that extracts heat from a liquid that is at a higher temperature than its surroundings; can be used to transfer heat from a reservoir outside in order to heat a building)
S: (n) heliograph (an apparatus for sending telegraphic messages by using a mirror to turn the sun's rays off and on)
S: (n) incubator, brooder (apparatus consisting of a box designed to maintain a constant temperature by the use of a thermostat; used for chicks or premature infants)
S: (n) instillator (medical apparatus that puts a liquid into a cavity drop by drop)
S: (n) Kipp's apparatus (a laboratory apparatus for producing a gas (usually hydrogen sulfide) by the action of a liquid on a solid without heating)
S: (n) lighting (apparatus for supplying artificial light effects for the stage or a film)
S: (n) nuclear reactor, reactor ((physics) any of several kinds of apparatus that maintain and control a nuclear reaction for the production of energy or artificial elements)
S: (n) optical bench (apparatus for observation and measurement of optical phenomena)
S: (n) pendulum (an apparatus consisting of an object mounted so that it swings freely under the influence of gravity)
S: (n) still (an apparatus used for the distillation of liquids; consists of a vessel in which a substance is vaporized by heat and a condenser where the vapor is condensed)