con-tigno, no perf., ātum, 1, v. a. [tignum],
to join together with beams, to furnish with beams, joists , or rafters (rare), Caes. B. C. 2, 15; Vitr. 1, 5; Plin. 9, 3, 2, § 7.
con-tīgnō —, ātus, āre com-+tignum, to join with beams, furnish with joists , Cs. ...
An Elementary Latin Dictionary