1. (n.) Originally, a back door or gate; a private entrance; hence, any small door or gate.

2. (n.) A subterraneous passage communicating between the parade and the main ditch, or between the ditches and the interior of the outworks.

3. (a.) Back; being behind; private.

French door aft after aftermost afterpart afterpiece archway back back door back seat back side backward barway behind breech bulkhead carriage entrance cellar door cellarway door doorjamb doorpost doorway front door gate gatepost gateway hatch hatchway heel hind hind end hind part hinder hindermost hindhand hindhead hindmost lintel occiput porch portal porte cochere posterior propylaeum pylon rear rear end rearmost rearward retrograde reverse scuttle side door stern stile storm door tail tail end tailpiece threshold tollgate trap trap door turnpike turnstile