a. Arch. [irreg. f. L. trab-em beam, instead of the regular form TRABAL.] Of the nature of a horizontal beam, beam-like.
1862. Sir H. Acland, in Macm. Mag., V. 527 (Descr. Oxford Museum). Extending laterally … arise two slender spanners to the [iron] trabeal beam before referred to as sustaining the rafters.
1866. Athenæum, 18 Aug., 214/2. Trabeal forms prevail.
