Definify.com

Webster 1913 Edition

Noun.

(Fort.)

An outwork composed of two demibastions joined by a curtain. It is connected with the works in rear by long wings.

Noun.

In fortification, an outwork composed of two demi-bastions joined by a curtain.

hornwork ‎(plural hornworks)

A type of fortification consisting of a pair of demi-bastions with a curtain wall connecting them and with two long sides directed upon the faces of the bastions, or ravelins of the inner fortifications, so as to be defended by them.