Lexical Definition

‎ζεστός‎ zestós (dzes-tos') hot ^G:A
from ‎ζέω‎

hot.

• boiled, i.e. (by implication) calid (figuratively, fervent)

Abbott-Smith

**† ζεστός, -ή, -όν (ζέω), [in Aq.: Le 6:21 (14); in Al.: Le 7:12**;]
boiling hot (Strab., al.): metaph., Re 3:15, 16.†

Abbott-Smith References

Liddell-Scott-Jones

ζεστός, ή, όν,

(ζέω) seethed, boiled, κρέα ζ. καὶ ὀπτά [Refs 2nd c.AD+]

__II hot, ὕδωρ [Refs 2nd c.BC+]; ὕδατα ζ., of hot springs, [Refs 1st c.BC+]; opposed to χλιαρός, [Refs 2nd c.AD+]; λίθος Ps.-[Refs 1st c.AD+]; εἰ δὲ -οτέρας κράσεως δέοιντο if they want the oil-bath hotter, [NT+1st c.AD+]

_{LSJ Scripture Refs: Rev.3.15}