pearl(shelly concretion, usually rounded and having a brilliant luster, with varying tints, found in the mantle, or between the mantle and shell, of certain bivalve mollusks, especially in the pearl oysters and river mussels, and sometimes in certain univalves)
Kazimierz Nitsch (1907) “perła”, in “Dyalekty polskie Prus zachodnich”, in Materyały i Prace Komisyi Językowej Akademii Umiejętności w Krakowie (in Polish), volume 3, Krakow: Akademia Umiejętności, page 390
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