ˈruek+ˌ- noun
Etymology: German literally, back umlaut, from rück- (from zurück back, backward, from Middle High German ze rücke, from ze to — from Old High German zi — + rücke back, from Old High German hrukki ) + umlaut — more at to , ridge , umlaut
: the absence of umlaut of the stem vowel in the past tense and past participle of some Germanic weak verbs as a result of the loss of i in the following syllable before the umlaut period