LSJ
τό, three hours, Lat. trihorium, Aus. Idyll. 10.87, Ep. 14.62.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
TBESG
trihorium (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