LSJ
τό, sweeper, duster made of palm-leaves, κ. φοινίκων LXX Le. 23.40, BGU 1120.17 (i BC).
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
TBESG
a palm branch (MT)
Translators Brief lexicon of Extended Strongs for Greek based on Abbot-Smith, A Manual Greek Lexicon of the New Testament (1922) (=AS), with corrections and adapted by Tyndale Scholars