from Wiktionary, Creative Commons Attribution/Share-Alike License
- n. Plural form of tiebeam.
Sorry, no etymologies found.
They are divided into bays, each 7 ft. 9 in. wide, by vertical shafts, from which, at a height of 5 ft. 9 in. from the ground, spring the braces which support the tiebeams of the roof.