Lexical Definition

‎φιλόστοργος‎ philóstorgos (fil-os'-tor-gos) affectionate ^G:A
from ‎φίλος‎ and (cherishing one's kindred, especially parents or children)

kindly affectioned.

• fond of natural relatives, i.e. fraternal towards fellow Christian

Abbott-Smith

** φιλόστοργος, -ον (< στοργή, family affection), [in LXX: IV Mac 15:13 * ;]
tenderly loving, affectionate (Xen., Plut., al.): of Christians, Ro 12:10.†

Abbott-Smith References

Liddell-Scott-Jones

φιλόστοργος-ος, ον,

(στέργω, στοργή) loving tenderly, affectionate, frequently of family affection, [Refs 5th c.BC+]; of a nurse, [Refs 2nd c.AD+]; of horses, [Refs 4th c.BC+]; title of two queens named Athenais, [NT+1st c.AD+]: comparative, nihil -ότερον[Refs 1st c.BC+]: superlative, -οτάτη διαφερόντως πρός τινα [Refs 5th c.BC+]. adverb -γως[Refs 4th c.BC+]; φ. ἔχειν πρός.. [Refs 1st c.AD+]; literae φ. scriptae, [Refs 1st c.BC+]: comparative -ότερον[Refs]: superlative -ότατα[Refs 4th c.AD+]

_{LSJ Scripture Refs: Rom.12.10}