| NOUN | substance | crown glass | a glass blown into a globe which is later flattened and spun to form a disk |
|---|---|---|---|
| substance | crown glass, optical crown, optical crown glass | optical glass of low dispersion and low refractive index |
| Meaning | A glass blown into a globe which is later flattened and spun to form a disk. | |
|---|---|---|
| Broader | glass | A brittle / brittle transparent solid with irregular atomic structure |
| Meaning | optical glass of low dispersion and low refractive index. | |
|---|---|---|
| Synonyms | optical crown, optical crown glass | |
| Broader | optical glass | Clear homogeneous glass of known refractive index |
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