αἱμόκερχνον
From LSJ
τὸ δ' ἐξαίφνης τὸ ἐν ἀναισθήτῳ χρόνῳ διὰ μικρότητα ἐκστάν → suddenly refers to what has departed from its former condition in a time imperceptible because of its smallness
English (LSJ)
τό,
A cough with bloodspitting, Hp.Epid.4.37.
Greek (Liddell-Scott)
αἱμόκερχνον: το, ὀλίγος βὴξ μεθ’ αἱμοπτυσίας, Ἱππ. παρ’ Ἐρωτ.