Lexical Definition

‎θέρμη‎ thérmē (ther'-may) heat ^G:N-F
from the base of ‎θέρος‎

heat.

• warmth

Abbott-Smith

θέρμη, -ης, ἡ, [in LXX: Jb 6:17, Ps 18(19):6*, Ec 4:11 (חמם and derivatives), Si 38:28*;]
heat: Ac 28:3.†

Abbott-Smith References

Liddell-Scott-Jones

θέρμη,

also θέρμᾰ (which see), ἡ, heat, [NT+5th c.BC+]; τῆς θ. when it is hot, [Refs 6th c.AD+]; feverish heat, [Refs 5th c.BC+]

__II θέρμαι, αἱ, hot springs, [Refs 2nd c.BC+]
__II.2 hot baths, [Refs 2nd c.AD+]

_{LSJ Scripture Refs: Acts.28.3}