[ˏdemi'bæstʃәn]
n.
(只有一个翼侧的)半棱堡

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.