Lexical Definition

‎πτέρνα‎ ptérna (pter'-nah) heel ^G:N-F
of uncertain derivation

heel.

• the heel (figuratively)

Abbott-Smith

πτέρνα, -ης, ἡ, [in LXX for עָקֵב;]
the heel: fig., ἐπαίρειν τὴν π. ἐπί, Jo 13:18(LXX).†

Abbott-Smith References

Liddell-Scott-Jones

πτέρνα

[Refs 5th c.BC+], later πτέρνᾰ [LXX+3rd c.BC+], ἡ, heel, [Refs 8th c.BC+]; under part of the heel, [Refs 4th c.BC+]; heel-bone, [Refs 4th c.BC+]

__2 hoof, [LXX]
__3 heel of a shoe, [Refs 3rd c.BC+]
__4 footstep, [LXX]
__II metaphorically, foot or lower part of anything, πύργων [Refs 3rd c.BC+]; of a mast, [Refs 2nd c.BC+] (but, waist of a ship, [Refs 2nd c.BC+]
__II.2 butt-end of the ἀγκών of a torsion-engine, [Refs 3rd c.BC+]; of a surgical machine, [Refs 4th c.AD+]
__III ham (mock Epicism formed from Latin perna), [Refs]; falsa lectio for{πέρνα} in [Refs 6th c.AD+]

_{LSJ Scripture Refs: LXX.Gen.3.15 ☩ LXX.Judg.5.22 ☩ LXX.Song.1.8}