Definition of photonic crystal in English:

photonic crystal

Syllabification: pho·ton·ic crys·tal
Pronunciation: /fōˌtänik ˈkrist(ə)l/

Entry from US English dictionary

noun

A synthetic crystal that can manipulate or be sensitized to respond to specific wavelengths of light. Its development suggests the possibility of increased miniaturization and efficiency of computing components and other technologies.

Definition of photonic crystal in:

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Word of the day abjure
Pronunciation: əbˈdʒʊə
verb
solemnly renounce (a belief, cause, or claim)