Lexical Definition

‎πτύρω‎ ptýrō (ptoo'-ro) to frighten ^G:V
from a presumed derivative of ‎πτύω‎ (and thus akin to ‎πτοέω‎)

terrify.

• to frighten

Abbott-Smith

* πτύρομαι, depon.,
to be startled, frightened: Phl 1:28. (The active πτύρω is also found in some late writers.)†

Abbott-Smith References

Liddell-Scott-Jones

πτύρομαι [ῡ],

aorist 2 ἐπτύρην [ῠ] [Refs 1st c.AD+], infinitive πτυρῆναι [Refs 5th c.BC+]:—passive, to be scared or frightened, [Refs 5th c.BC+]; of the soul, [Refs 2nd c.AD+]; especially of horses, shy, start, [Refs 1st c.BC+], Plu.[same place]; τινι at a thing, [Refs 1st c.AD+] start at, be alarmed at death, Pl.[same place]; ἔν τινι [NT]

_{LSJ Scripture Refs: Phil.1.28}