n. 门柱

[ noun ]
either of two posts that bound a gate
<noun.artifact>

Gatepost \Gate"post`\ (g[=a]t"p[=o]st`), n.
1. A post to which a gate is hung; -- called also {swinging
post} or {hinging post}.

2. A post against which a gate closes; -- called also
{shutting post}.