Definition of achromatic lens in English:

achromatic lens

Syllabification: ach·ro·mat·ic lens

Entry from US English dictionary

noun

A lens that transmits light without separating it into constituent colors.

Definition of achromatic lens in:

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Word of the day hypnopompic
Pronunciation: ˌhɪpnə(ʊ)ˈpɒmpɪk
adjective
relating to the state immediately preceding waking up