12 letters · 22 points in Scrabble
noun a premature systole resulting in a momentary cardiac arrhythmia
originEtymology tree Proto-Indo-European *h₁éǵʰ Proto-Indo-European *-s Proto-Indo-European *h₁éǵʰs Proto-Indo-European *-teros Proto-Indo-European *h₁eǵʰsteros Proto-Italic *eksteros Latin exter Latin extrā English extra- English systole English extrasystole From extra- + systole.
Etymology from Wiktionary, CC BY-SA 3.0