| open sesame | any very successful means of achieving a result |
| open primary | a primary in which any registered voter can vote (but must vote for candidates of only one party) |
open frame
break | any frame in which a bowler fails to make a strike or spare, the break in the eighth frame cost him the match |
back door
backdoor | a secret or underhand means of access (to a place or a position), he got his job through the back door |
| open-heart surgery | heart surgery in which the rib cage is spread open, the heart is stopped and blood is detoured through a heart-lung machine while a heart valve or coronary artery is surgically repaired |
| 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 |
| bi-fold door | an interior door |
| car door | the door of a car |
| cargo door | door used to load or unload cargo |
| 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 |
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 |
| fireplace hearth open fireplace | an open recess in a wall at the base of a chimney where a fire can be built, the fireplace was so large you could walk inside it, he laid a fire in the hearth and lit it, the hearth was black with the charcoal of many fires |
folding door
accordion door | an interior door that opens by folding back in sections (rather than by swinging on hinges) |
| 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 |
hatchback
hatchback door | a sloping rear car door that is lifted to open |
| interior door | a door that closes off rooms within a building |
| latch door latch | spring-loaded doorlock that can only be opened from the outside with a key |
open-air market
open-air marketplace
market square | a public marketplace where food and merchandise is sold |
| open circuit | an incomplete electrical circuit in which no current flows |
open-end wrench
tappet wrench | a wrench having parallel jaws at fixed separation (often on both ends of the handle) |
| open-hearth furnace | a furnace for making steel in which the steel is placed on a shallow hearth and flames of burning gas and hot air play over it |
| open sight | rear gunsight having an open notch instead of a peephole or telescope |
| open weave | a weave in which warp threads never come together, leaving interstices in the fabric |
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 |
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 |
| stage door | an entrance to the backstage area of theater, used by performers and other theater personnel |
| storm door | an extra outer door for protection against severe weather or winter |
swing door
swinging door | a door that swings on a double hinge, opens in either direction |
| trap door | a hinged or sliding door in a floor or ceiling |
wicket wicket door
wicket gate | small gate or door (especially one that is part of a larger door) |
| door | anything providing a means of access (or escape), we closed the door to Haitian immigrants, education is the door to success |
| open door | freedom of access, he maintained an open door for all employees |
open
surface | information that has become public, all the reports were out in the open, the facts had been brought to the surface |
open interval
unbounded interval | an interval that does not include its endpoints |
back door
backdoor | an undocumented way to get access to a computer system or the data it contains |
| open account | an unpaid credit order |
| open letter | a letter of protest, addressed to one person but intended for the general public |
open-door policy
open door | the policy of granting equal trade opportunities to all countries |