那时，和现在一样，该词表示玻璃这种物质。

Then, as now, the word meant the substance glass.

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人们这么指是因为玻璃和很多矿物质不同，它并不形成晶体，而是由构成分子随意混在一起组成，就像在液体中一样。

The reason people say this is that unlike many minerals glass isn't formed into crystals but made up of its constituent molecules all jumbled together at random as they would be in a liquid.

youdao

50岁以上做过玻璃体切除手术（即将眼内的玻璃胶样物质取出）的人群，其患白内障的风险增加。

People older than age 50 who have had the vitreous gel removed from their eye (vitrectomy) have an increased risk of cataracts.

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