Lexical Definition

‎φθινοπωρινός‎ phthinopōrinós (fthin-op-o-ree-nos') autumnal ^G:A
from derivative of (to wane

whose fruit withereth.

• akin to the base of ‎φθείρω‎) and ‎ὀπώρα‎ (meaning late autumn)
• autumnal (as stripped of leaves)

Abbott-Smith

* φθιν-οπωρινός, -ή, -όν (< φθινόπωρον, late autumn),
autumnal: δένδρα φ., autumn trees (said to be without fruit therefore at a time when fruit might be expected; v. Mayor's elaborate note, Ep. Ju., 55-59, and reff. there): Ju 12.†

Abbott-Smith References

Liddell-Scott-Jones

φθινοπωρινός-οπωρῐνός, ή, όν,

autumnal, [Refs 5th c.BC+]