noun
widemouthed jar; widemouthed bottle
Refers to a jar or bottle with a wide opening, often used for preserves, pickles, or storage.
祖母は広口瓶に梅干しを保存している。
My grandmother stores pickled plums in a widemouthed jar.
瓶 is a general term for any bottle or jar, while 広口瓶 specifically emphasizes the wide mouth.
Compound of 広口 (hirokuchi, 'wide mouth') and 瓶 (bin, 'bottle, jar').