The story
- Proto-Indo-European · derived from*h₂eyd-
- Proto-Germanic · inherited from*aitrą“gland, matter”
- Proto-West Germanic · inherited from*aitr
- Old English · inherited fromāttor
- Middle English · inherited fromatter
- English todayatter
From Middle English atter, ater, from Old English āttor, ǣttor, ātor (“poison”), from Proto-West Germanic *aitr, from Proto-Germanic *aitrą (“gland, matter”), from Proto-Indo-European *h₂eyd-, *h₂oyd- (“tumor, abscess”), related to Ancient Greek οἶδος (oîdos, “swelling, tumour, abscess, produced by internal action”). Cognate with Scots attir (“corrupt matter, pus”), Scots atter, etter (“poison, venom”), Shetlandic eter (“poison; bitter cold”), Old Norse eitr, Icelandic eitur (“poison”), Faroese eitur, Norwegian eiter (“venom”), Swedish etter (“poison, venom, virulence”), Danish edder, ædder (“venom”), Saterland Frisian Atter (“pus”), Dutch etter (“pus”), German Eiter (“poison, pus”).
Etymology from Wiktionary, CC BY-SA 4.0.