Recipiangle n. : An instrument with two arms that are pivoted together at one end, and a graduated arc, -- used by military engineers for measuring and laying off angles of fortifications.

Example:


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Defination from the web:
recipiangle. Plural. recipiangles. recipiangle (plural recipiangles) An instrument with two arms that are pivoted together at one end, and a graduated arc, used by military engineers for measuring and laying off angles of fortifications. ...