recipiangle

from The Century Dictionary.

• noun In engineering, an instrument formerly used for measuring angles, especially in fortification.

from the GNU version of the Collaborative International Dictionary of English.

• noun 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.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun 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.