portcullis

Threshold is a related term of portcullis.

As nouns the difference between threshold and portcullis

is that threshold is the bottom-most part of a doorway that one crosses to enter; a sill while portcullis is a gate in the form of a grating which is lowered into place at the entrance to a castle, fort, etc.

As a verb portcullis is

to obstruct with, or as with, a portcullis; to shut; to bar.

As nouns the difference between portcullis and bacule

is that portcullis is a gate in the form of a grating which is lowered into place at the entrance to a castle, fort, etc while bacule is in fortification, a kind of portcullis or gate, made like a pitfall, with a counterpoise, and supported by two large stakes.

As a verb portcullis

is to obstruct with, or as with, a portcullis; to shut; to bar.