Webster's English Dictionary

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transept

tran.sept \'tran(t)s-.ept\ \tran(t)s-'ep-t*l\ n [NL transeptum, fr. L 
   trans- + septum, saeptum enclosur]e, wall - more at SEPTUM : the part of a 
   cruciform church that crosses at right angles to the great est length 
   between the nave and the apse or choir; also : either of the projecting 
   ends of a transept - tran.sep.tal aj