OPAL


Meaning of OPAL in English

[opal] n [L opalus, fr. Gk opallios, fr. Skt upala stone, jewel] (1591): a mineral that is a hydrated amorphous silica softer and less dense than quartz and typically with definite and often marked iridescent play of colors

Merriam-Webster English vocab.      Английский словарь Merriam Webster.