LSJ
η, ον, made of tortoise-shell, Edict.Diocl. 16.6.
Liddell-Scott-Jones, Greek-English Lexicon (9th ed., 1940)
TBESG
made of tortoise-shell (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