14 letters · 30 points in Scrabble
originEtymology tree Proto-Indo-European *h₁éǵʰs Proto-Indo-European *-teros Proto-Indo-European *h₁eǵʰsteros Proto-Italic *eksteros Latin exter Latin extrā English extra- English embryonic English extraembryonic From extra- + embryonic.
Etymology from Wiktionary, CC BY-SA 3.0