Lexical Definition

‎προσάββατον‎ prosábbaton (pros-ab'-bat-on) Friday G:N-N
from ‎πρό‎ and ‎σάββατον‎

day before the sabbath.

Abbott-Smith

προ-σάββατον, -ου, τό, [in LXX: Ps 91 (92) tit.*, א (שַׁבָּת) Ps 92 (93) tit.*, Jth 8:6*;]
the day before the Sabbath: Mk 15:42 (L, Tr., txt., πρὸς σ.).†

Abbott-Smith References

Book Refs
Psalms 92:1* · 93:1*
Mark 15:42

Liddell-Scott-Jones

name of: שַׁבָּת

προσάββατον, τό,

eve of the sabbath, [LXX+NT], Bull.Inst.franc. d'Arch.orientale [Refs]

LSJ Scripture Refs: Mark.15.42