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Meaning of heavy glass | Babel Free

Noun CEFR B2

Definitions

A heavy optical glass, consisting essentially of potassium borosilicate.

countable, uncountable

CEFR level

B2

Upper Intermediate
This word is part of the CEFR B2 vocabulary — upper intermediate level.

See also

heavy going heavy goods vehicle heavy heart heavy hitter heavy hydrogen heavy icebreaker