trăbĕcŭla or trăbĭcŭla, ae, f. dim. [trabs],
a little beam , Cato R. R. 18, 5; Vitr. 10, 21; Inscr. Grut. 207, 1.
·noun A small bar, rod, bundle of fibers, or septal membrane, in the framework of an organ part. ...
Webster's Dictionary of the English Language