Table of Contents POS
WORDNET DICTIONARY
CIDE DICTIONARY
THESAURUS

RELATED WORDS : accordion door answer back back back and fill back and forth back away back brace back breaker back burner back channel back circle back country back down back end back entrance back exercise back fire back judge back matter back number back of beyond back off back out back pack back porch back room back saw back scratching back seat back stairs back street back talk back to back back tooth back up back way barn door beat back bi-fold door bounce back break one's back bring back buy back call back car door cargo door carry back ceding back choke back come back come back at coming back cut back date back die back door door guard door latch door prize double back double door draw back drive back drop back dutch door exterior door fall back fat back feed back fight back fire door flanker back flash back folding door force back french door from way back front door get back get back at give back go back go back on go back over half door hang back hark back hatchback door hold back interior door keep back kick back knock back lean back look back louvered door move back move back and forth next door open door outside door pat on the back pay back paying back play back pull back push back put back rear back relation back revolving door roll back running back screen door send back service door set back show the door shrink back side door sink back sit back slide back sliding door slip back snap back stage door stand back storm door strike back swing door swinging door take back talk back think back throw back thrust back toss back trap door travel back and forth trim back turn back water back watteau back wicket door win back

WORDNET DICTIONARY

Noun back door has 3 senses

• back door(n = noun.act) backdoor - a secret or underhand means of access (to a place or a position); "he got his job through the back door"
is a kind of access

• back door(n = noun.communication) backdoor - an undocumented way to get access to a computer system or the data it contains; Array
is a kind of access, access code

• back door(n = noun.artifact) back entrance, backdoor - an entrance at the rear of a building; Array
is a kind of exterior door, outside door

CIDE DICTIONARY

THESAURUS

back door

French door, afterpart, afterpiece, archway, back, back road, back seat, back side, back stairs, back street, back way, backstairs, barway, behind, bolt-hole, breech, bulkhead, by-lane, bypass, bypath, byroad, bystreet, byway, carriage entrance, cellar door, cellarway, clandestine, covert, covert way, detour, door, doorjamb, doorpost, doorway, escalier derobe, escape hatch, escape route, feline, front door, furtive, gate, gatepost, gateway, hatch, hatchway, heel, hidlings, hind end, hind part, hindhead, hole-and-corner, hugger-mugger, lintel, occiput, porch, portal, porte cochere, posterior, postern, privy, propylaeum, pylon, quiet, rear, rear end, rearward, reverse, roundabout way, scuttle, secret exit, secret passage, secret staircase, shifty, side door, side road, side street, skulking, slinking, slinky, sly, sneaking, sneaky, stealthy, stern, stile, storm door, surreptitious, tail, tail end, tailpiece, threshold, tollgate, trap, trap door, turnpike, turnstile, under-the-counter, under-the-table, undercover, underground, underground railroad, underground route, underhand, underhanded, unobtrusive

For further exploring for "back door" in Webster Dictionary Online