| backdoor | (noun) a secret or underhand means of access (to a place or a position) | Synonyms: back door |
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| (noun) an entrance at the rear of a building | Synonyms: back door, back entrance |
| (noun) an undocumented way to get access to a computer system or the data it contains | Synonyms: back door |
| barndoor | (noun) an opaque adjustable flap on a lamp fixture; used in photography to cut off light from particular areas | - |
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| door | (noun) a swinging or sliding barrier that will close the entrance to a room or building or vehicle | - |
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| (noun) the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close | Synonyms: doorway, room access, threshold |
| (noun) a room that is entered via a door | - |
| (noun) a structure where people live or work (usually ordered along a street or road) | - |
| (noun) anything providing a means of access (or escape) | - |
| doorbell | (noun) a push button at an outer door that gives a ringing or buzzing signal when pushed | Synonyms: bell, buzzer |
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| doorcase | (noun) the frame that supports a door | Synonyms: doorframe |
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| doorframe | (noun) the frame that supports a door | Synonyms: doorcase |
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| doorhandle | (noun) a knob used to release the catch when opening a door (often called `doorhandle' in Great Britain) | Synonyms: doorknob |
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| doorjamb | (noun) a jamb for a door | Synonyms: doorpost |
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| doorkeeper | (noun) someone who guards an entrance | Synonyms: door guard, doorman, gatekeeper, hall porter, ostiary, porter |
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| (noun) an official stationed at the entrance of a courtroom or legislative chamber | Synonyms: usher |
| (noun) the lowest of the minor Holy Orders in the unreformed Western Church but now suppressed by the Roman Catholic Church | Synonyms: ostiarius, ostiary |
| doorknob | (noun) a knob used to release the catch when opening a door (often called `doorhandle' in Great Britain) | Synonyms: doorhandle |
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| doorknocker | (noun) a device (usually metal and ornamental) attached by a hinge to a door | Synonyms: knocker, rapper |
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| doorlock | (noun) a lock on an exterior door | - |
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| doorman | (noun) someone who guards an entrance | Synonyms: door guard, doorkeeper, gatekeeper, hall porter, ostiary, porter |
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| doormat | (noun) a mat placed outside an exterior door for wiping the shoes before entering | Synonyms: welcome mat |
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| (noun) a person who is physically weak and ineffectual | Synonyms: weakling, wuss |
| doornail | (noun) a nail with a large head; formerly used to decorate doors | - |
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| doorplate | (noun) a nameplate fastened to a door; indicates the person who works or lives there | - |
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| doorpost | (noun) a jamb for a door | Synonyms: doorjamb |
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| doorsill | (noun) the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway | Synonyms: doorstep, threshold |
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| doorstep | (noun) the sill of a door; a horizontal piece of wood or stone that forms the bottom of a doorway and offers support when passing through a doorway | Synonyms: doorsill, threshold |
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| doorstop | (noun) a stop that keeps open doors from moving | Synonyms: doorstopper |
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| doorstopper | (noun) a stop that keeps open doors from moving | Synonyms: doorstop |
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| doorway | (noun) the entrance (the space in a wall) through which you enter or leave a room or building; the space that a door can close | Synonyms: door, room access, threshold |
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| dooryard | (noun) a yard outside the front or rear door of a house | - |
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| indoor | (adjective) located, suited for, or taking place within a building | - |
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| (adjective) within doors | - |
| indoors | (adverb) within a building | Synonyms: inside |
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| outdoor | (adjective) located, suited for, or taking place in the open air | Synonyms: out-of-door, outside |
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| (adjective) pertaining to or concerning the outdoors or outdoor activities | - |
| outdoors | (noun) where the air is unconfined | Synonyms: open, open air, out-of-doors |
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| (adverb) outside a building | Synonyms: alfresco, out of doors, outside |
| outdoorsman | (noun) a male person who spends time outdoors (e.g., hunting or fishing) | - |
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| outdoorsperson | (noun) a person who spends time outdoors (e.g., hunting or fishing) | - |
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| outdoorswoman | (noun) a woman who spends time outdoors (e.g., hunting and fishing) | - |
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| outdoorsy | (adjective) characteristic of or suitable to outdoor life | - |
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| tandoor | (noun) a clay oven used in northern India and Pakistan | - |
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