Parsing inflected forms may not always work as expected. If the following does not give the correct word, try Latin Words or Perseus.
trabs, trăbis (ante-class. collat. form of the nom. trăbes, Enn. ap. Cic. N. D. 3, 30, 75; id. Fat. 15, 35; id. Top. 16, 61, or Trag. v. 281 Vahl.; Cic. ap. Varr. L. L. 7, § 33 Müll., or Ann. v. 598 Vahl.), f. [τράπηξ]. 
- I.  Lit., a beam, a timber: tigna trabesque, Lucr. 2, 192 sq.; v. tignum; Caes. B. G. 2, 29; 3, 13; 7, 23; id. B. C. 2, 9; Plin. 16, 38, 73, § 184; Gell. 1, 13, 17; Ov. M. 3, 78.
 
- II.  Transf. 
 
- A.  A tree: silva frequens trabibus, Ov. M. 8, 329; cf. id. ib. 14, 360: securi Saucia trabs ingens, id. ib. 10, 373; cf. Varr. ap. Non. 178, 31; Prop. 3 (4), 22, 38: fraxineae, Verg. A. 6, 181: lucus trabibus obscurus acernis, id. ib. 9, 87: Val. Fl. 5, 640. 
 
- B.  Any thing made of beams or timbers. 
 
- 1.  Very freq., a ship or vessel: abiegna trabes, Enn. ap. Cic. N. D. 3, 30, 75: trabes rostrata per altum, id. ap. Varr. L. L. 7, § 33: jam mare turbari trabibus  …  vide bis, Verg. A. 4, 566: ut trabe Cypria Myrtoum pavidus nauta secet mare, Hor. C. 1, 1, 13; Ov. P. 1, 3, 76: Thessalica, Sen. Agam. 120.
 
- 2.  A roof: sub trabe citreā, Hor. C. 4, 1, 20; so in plur., id. ib. 2, 18, 3; 3, 2, 28. 
 
- 3.  A battering-ram, ballista, etc., Val. Fl. 6, 383.
 
- 4.  A javelin, Stat. Th. 5, 566; 9, 124.
 
- 5.  A club, cudgel, Stat. Th. 1, 621.
 
- 6.  A table, Mart. 14, 91, 2.
 
- 7.  A torch, Sen. Herc. Fur. 103. 
 
- 8.  In mal. part.  =  mentula, Cat. 28, 10.
 
- C.  A fiery phenomenon in the heavens, a meteor: emicant et trabes simili modo, quas δοκοὺς vocant, qualis cum Lacedaemonii classe victi imperium Graeciae amisere, Plin. 2, 26, 26, § 96: trabes et globi et faces et ardores, Sen. Q. N. 1, 1, 5; 1, 1, 15; 1, 15, 4; 7, 4, 3-5; 7, 5, 21; id. Ep. 94, 56.