Syriac

yatrā - rope; bowstring; cord; beam (LSyr. 313, SL 590)

PWS
*watar-/*watr- - tendon (SED I No. 290; Kogan 2011: 215)
is based on Hbr. yätär, Syr. yatrā, Arb. watar-, Gez. watr, Amh. wätär (some of them with non-anatomic meanings like ‘rope’, ‘cord’, ‘bowstring’)