אָלכע
'alder'

ETYMOLOGY

Polish olcha, Russian ольха; from PIE ✱h₂elis-eh₂-; the suffix ✱-is- is paralleled in OHG elira < ✱alizō(n)-
ON ǫlr, alr, OE alor, aler, English alder < ✱aluz-; OHG erila, elira, NHG Erle < ✱alis- (EUR); cf. Latin alnus, Lithuanian áalksna; "perhaps a European substrate word" (Kroonen)