| aircraft engine | the engine that powers and aircraft |
| automobile engine | the engine that propels an automobile |
auxiliary engine
donkey engine | (nautical) a small engine (as one used on board ships to operate a windlass) |
| cooling system engine cooling system | equipment in a motor vehicle that cools the engine |
diesel
diesel engine
diesel motor | an internalombustion engine that burns heavy oil |
| engine | motor that converts thermal energy to mechanical work |
| engine | an instrument or machine that is used in warfare, such as a battering ram, catapult, artillery piece, etc., medieval engines of war |
engine block
cylinder block
block | a metal casting containing the cylinders and cooling ducts of an engine, the engine had to be replaced because the block was cracked |
engineering
engine room | a room (as on a ship) in which the engine is located |
| externalombustion engine | a heat engine in which ignition occurs outside the chamber (cylinder or turbine) in which heat is converted to mechanical energy |
fanjet
fan-jet
fanjet engine
turbojet
turbojet engine
turbofan
turbofan engine | a jet engine in which a fan driven by a turbine provides extra air to the burner and gives extra thrust |
fire engine
fire truck | any of various large trucks that carry firemen and equipment to the site of a fire |
four-stroke engine
four-stroke internalombustion engine | an internalombustion engine in which an explosive mixture is drawn into the cylinder on the first stroke and is compressed and ignited on the second stroke, work is done on the third stroke and the products of combustion are exhausted on the fourth stroke |
| gas engine | an internalombustion engine similar to a gasoline engine but using natural gas instead of gasoline vapor |
gasoline engine
petrol engine | an internalombustion engine that burns gasoline, most automobiles are driven by gasoline engines |
| heat engine | any engine that makes use of heat to do work |
hydrogen bomb
H-bomb
fusion bomb
thermonuclear bomb | a nuclear weapon that releases atomic energy by union of light (hydrogen) nuclei at high temperatures to form helium |
internalombustion engine
ICE | a heat engine in which combustion occurs inside the engine rather than in a separate furnace, heat expands a gas that either moves a piston or turns a gas turbine |
| ion engine | a type of reaction-propulsion engine to propel rockets in space, a stream of positive ions is accelerated to a high velocity by an electric field |
| jet engine | a gas turbine produces a stream of hot gas that propels a jet plane by reaction propulsion |
locomotive
engine locomotive engine
railway locomotive | a wheeled vehicle consisting of a self-propelled engine that is used to draw trains along railway tracks |
| pilot engine | a locomotive that precedes a train to check the track |
radial engine
rotary engine | an internalombustion engine having cylinders arranged radially around a central crankcase |
ramjet
ramjet engine
atherodyde
athodyd
flying drainpipe | a simple type of jet engine, must be launched at high speed |
reaction-propulsion engine
reaction engine | a jet or rocket engine based on a form of aerodynamic propulsion in which the vehicle emits a high-speed stream |
| reciprocating engine | an internalombustion engine in which the crankshaft is turned by pistons moving up and down in cylinders |
rocket
rocket engine | a jet engine containing its own propellant and driven by reaction propulsion |
| rotary engine | an internalombustion engine in which power is transmitted directly to rotating components |
| steam engine | externalombustion engine in which heat is used to raise steam which either turns a turbine or forces a piston to move up and down in a cylinder |
switch engine
donkey engine | a locomotive for switching rolling stock in a railroad yard |
tank engine
tank locomotive | a locomotive that carries its own fuel and water, no tender is needed |
| traction engine | steam-powered locomotive for drawing heavy loads along surfaces other than tracks |
| valve-in-head engine | internalombustion engine having both inlet and exhaust valves located in the cylinder head |
Wankel engine
Wankel rotary engine
epitrochoidal engine | a rotary engine that is a four-stroke internalombustion engine without reciprocating parts |
| hydrogen ion concentration | the number of moles of hydrogen ions per cubic decimeter |
| search engine | a computer program that retrieves documents or files or data from a database or from a computer network (especially from the internet) |
| engine failure | engine does not run |
| hydrogen ion | a positively charged atom of hydrogen, that is to say, a normal hydrogen atomic nucleus |
engineer locomotive engineer
railroad engineer
engine driver | the operator of a railway locomotive |
| engine | something used to achieve a purpose, an engine of change |
| hydrogen bond | a chemical bond consisting of a hydrogen atom between two electronegative atoms (e.g., oxygen or nitrogen) with one side be a covalent bond and the other being an ionic bond |
hydrazoic acid
azoimide
hydrogen azide
HN | a colorless explosive liquid that is volatile and poisonous and foul-smelling |
| hydrogen cyanide | a highly poisonous gas or volatile liquid that smells like bitter almonds, becomes a gas at arounddegree Fahrenheit and is most dangerous when inhaled, the anhydride of hydrocyanic acid, used in manufacturing |
hydrogen
H
atomic number | a nonmetallic univalent element that is normally a colorless and odorless highly flammable diatomic gas, the simplest and lightest and most abundant element in the universe |
| hydrogen atom | an atom of hydrogen |
acidic hydrogen
acid hydrogen | a hydrogen atom in an acid that forms a positive ion when the acid dissociates |
deuterium
heavy hydrogen | an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen) |
bicarbonate
hydrogen carbonate | a salt of carbonic acid (containing the anion HCO) in which one hydrogen atom has been replaced, an acid carbonate |
bicarbonate of soda
sodium hydrogen carbonate
sodium bicarbonate
baking soda
saleratus | a white soluble compound (NaHCO) used in effervescent drinks and in baking powders and as an antacid |
hydrogen peroxide
peroxide | a viscous liquid with strong oxidizing properties, a powerful bleaching agent, also used (in aqueous solutions) as a mild disinfectant and (in strong concentrations) as an oxidant in rocket fuels |