The Collaborative International Dictionary
Demibastion
Demibastion \Dem"i*bas"tion\ (?; 106), n. [Cf. F. demi- bastion.] (Fort.) A half bastion, or that part of a bastion consisting of one face and one flank.
Wiktionary
demibastion
n. (context military English) A half bastion, or that part of a bastion consisting of one face and one flank.