לאָסק
'Łask (town in central Poland)'

ETYMOLOGY

Beider suggests that the name was borrowed from Old Polish, before the 16th c., when the first vowel of Łask was long /aː/ (perhaps the vowel was lengthened in a stressed syllable before two consonants of which the first is a sibilant). The vowel merged with A₂ and had the corresponding different realizations in Yiddish dialects (e.g., "Lūsk" in CY).

LU:SK [Yiddishland, Paul Glasser]