ἔμπρησις
From LSJ
οὐ γὰρ συμφύεται τὰ πεπηγότα ὤσπερ τὰ ὑγρά (Aristotle, Meteorologica 348a.14) → since solid bodies/frozen drops cannot coalesce like liquid ones
English (LSJ)
εως, Ion. -ιος, ἡ,
A burning, Hdt.8.55, D.H.4.40; οἰκιῶν Pl.R.470a: pl., ἐμπρήσεις οἰκιῶν Aeschin.3.157. II inflammation, Gal.12.693.
German (Pape)
[Seite 817] ἡ, das Anzünden, Verbrennen; Her. 8, 55; οἰκιῶν Plat. Rep. V, 470 a; Folgde.