back door
backdoor | a secret or underhand means of access (to a place or a position), he got his job through the back door |
| trap-door spider | American spider that constructs a silk-lined nest with a hinged lid |
back door
backdoor
back entrance | an entrance at the rear of a building |
| barn door | the large sliding door of a barn |
bevel gear
pinion and crown wheel
pinion and ring gear | gears that mesh at an angle |
| bi-fold door | an interior door |
| car door | the door of a car |
| cargo door | door used to load or unload cargo |
| chafing gear | covering (usually rope or canvas) of a line or spar to protect it from friction |
differential gear
differential | a bevel gear that permits rotation of two shafts at different speeds, used on the rear axle of automobiles to allow wheels to rotate at different speeds on curves |
| door | a swinging or sliding barrier that will close the entrance to a room or building or vehicle, he knocked on the door, he slammed the door as he left |
| door | a room that is entered via a door, his office is the third door down the hall on the left |
| door | a structure where people live or work (usually ordered along a street or road), the office next door, they live two doors up the street from us |
doorway
door room access
threshold | the entrance (the space in a wall) through which you enter or leave a room or building, the space that a door can close, he stuck his head in the doorway |
| double door | two vertical doors that meet in the middle of the door frame when closed |
Dutch door
half door | an exterior door divided in two horizontally, either half can be closed or open independently |
epicyclic train
epicyclic gear train | a system of epicyclic gears in which at least one wheel axis itself revolves about another fixed axis |
exterior door
outside door | a doorway that allows entrance to or exit from a building |
| fire door | a fireesistant door that can be closed to stop the spread of a fire |
first gear
first
low gear
low | the lowest forward gear ratio in the gear box of a motor vehicle, used to start a car moving |
fishing gear
tackle fishing tackle
fishing rig
rig | gear used in fishing |
folding door
accordion door | an interior door that opens by folding back in sections (rather than by swinging on hinges) |
| foul-weather gear | protective garment that is intended to keep the wearer dry and warm in bad weather |
| French door | a light door with transparent or glazed panels extending the full length |
front door
front entrance | exterior door (at the entrance) at the front of a building |
gear
gear wheel
geared wheel
cogwheel | a toothed wheel that engages another toothed mechanism in order to change the speed or direction of transmitted motion |
gear paraphernalia
appurtenance | equipment consisting of miscellaneous articles needed for a particular operation or sport etc. |
| gear gear mechanism | a mechanism for transmitting motion for some specific purpose (as the steering gear of a vehicle) |
gearbox
gear box
gear case | the shell (metal casing) in which a train of gears is sealed |
gearing
gear geartrain
power train
train | wheelwork consisting of a connected set of rotating gears by which force is transmitted or motion or torque is changed, the fool got his tie caught in the geartrain |
gearshift
gearstick
shifter
gear lever | a mechanical device for engaging and disengaging gears, in Britain they call a gearshift a gear lever |
hatchback
hatchback door | a sloping rear car door that is lifted to open |
high gear
high | a forward gear with a gear ratio that gives the greatest vehicle velocity for a given engine speed |
| interior door | a door that closes off rooms within a building |
| landing gear | an undercarriage that supports the weight of the plane when it is on the ground |
| latch door latch | spring-loaded doorlock that can only be opened from the outside with a key |
planetary gear
epicyclic gear
planet wheel
planet gear | an outer gear that revolves about a central sun gear of an epicyclic train |
| reduction gear | gearing that reduces an input speed to a slower output speed |
reverse
reverse gear | the gears by which the motion of a machine can be reversed |
revolving door
revolver | a door consisting of four orthogonal partitions that rotate about a central pivot, a door designed to equalize the air pressure in tall buildings |
screen door
screen | a door that consists of a frame holding metallic or plastic netting, used to allow ventilation and to keep insects from entering a building through the open door, he heard the screen slam as she left |
second gear
second | the gear that has the second lowest forward gear ratio in the gear box of a motor vehicle, he had to shift down into second to make the hill |
service door
service entrance
servant's entrance | an entrance intended for the use of servants or for delivery of goods and removal of refuse |
side door
side entrance | an exterior door at one side of a building |
| sliding door | a door that opens by sliding instead of swinging |
spur gear
spur wheel | gear wheels that mesh in the same plane |
stable gear
saddlery
tack | gear for a horse |
| stage door | an entrance to the backstage area of theater, used by performers and other theater personnel |
| steering gear | a gear that couples the steering wheel to the steering linkage of a motor vehicle |
| storm door | an extra outer door for protection against severe weather or winter |