The Lexeis of the Octateuch is a medieval-era lexicon of difficult Koine expressions and hebraisms in the ancient Greek translations of the Old Testament. The lexicon is found mostly in manuscripts also containing the lexicon of Cyril, a dictionary to which the Lexeis of the Octateuch is strongly associated (see Drachmann 1936: 54-55, no.6; Benediktsson 1938; Hunger 1978: 37 with n.24; Latte 1953: XLV with n.3).
The full title of the lexicon (as preserved into the manuscripts) ascribes the Lexeis of the Octateuch to a certain (and otherwise unknown) grammarian Stephanos, who cannot be identified at the moment with any other grammarian known by that name (see Benediktsson 1938: 257 with Greek text in p. 261). …
Papanikolaou, Dimitrios. "Lexeis of the Octateuch". The Literary Encyclopedia. First published 11 March 2019
[https://www.litencyc.com/php/stopics.php?rec=true&UID=19561, accessed 18 November 2019.]