אײַטער
־ס
דער
'udder'

ETYMOLOGY

{DW² notes that the older gender was masculine (as still in Yiddish), and that an unrounded form (eiter instead of euter, as in Yiddish) was widespread from the 16th to the 18th c.}
ON júr, júgr (< ✱júðr; from PGmc ✱eudra-), OE ūder, English udder, OS ūder, Dutch uier, OHG ūtar(o), ūtro, MHG iuter, ūter, ENHG euter, eiter, eyter, eyder, NHG Euter; from PGmc ✱ūdra(n)- (or ✱eudra- ~ ✱ūdra-), from ✱eudur, ✱ūdraz; from PIE ✱h₁éu(H)dʰ-r̥, ✱h₁(H)dʰ-r-ós (or ✱h₁(e)uHdʰ-r/n-, or ūdʰar-/-n-). Kroonen notes "The heteroclitic r/n-suffix was strongly associated with body parts in Indo-European."
Related: Sanskrit ū́dhar ~ ū́dhan, Latin ūber, Greek οὖθαρ, οὖθατος, Latin ūber, Lithuanian ūdrúoti 'to be pregnant'

WESTERN

Alsace (France)

dr̩ ˈajdʁ̥̩ {ALSACE, 47075 Mulhouse, 018-090}

Oyberland (West Transcarpathian)

ajtər {WTCP, Dunajská Streda, 47179}
- ə grɔjsə ⲁjtα אַ גרויסע אײַטער

ajtər {WTCP, Vác, 47197}

aːtr̩ > ajtr {WTCP, Berettyó-Újfalu, 47212}

CENTRAL

Unterland (East Transcarpathian)

ə fíl áːtər אַ פֿול אײַטער {ETCP, Sîg Felső Szek, 47223}

dr̩ ajtr̩ {ETCP, Mukachevo, 48226}

s aːtɛ, an aːtɛ, a ʔaːtɛ {POLAND, Wolbrom, 50196}

NORTHEASTERN

Lithuania

dɛʀ ájtɛʀ {LITHUANIA, Vilnius, 54257}