瓶 is a bound form (b.f.) that carries the core meaning of 'bottle', 'vase', or 'flask'. It rarely stands alone in modern Chinese — you almost always encounter it as part of a compound word like 瓶子 (bottle), 酒瓶 (wine bottle), or 花瓶 (vase). Note that when used as a measure word (e.g. 一瓶水), it behaves differently; the present entry covers only its use as a bound-form noun constituent.