crystal
https://gyazo.com/f64c6b20e9ab153407994575c18a07df
source: By w?odi from Szczecin, Poland - Rock salt crystals, CC BY-SA 2.0
noun
1. a piece of a homogeneous solid substance having a natural geometrically regular form with symmetrically arranged plane faces.
水晶
Chemistry any solid consisting of a symmetrical, ordered, three-dimensional aggregation of atoms or molecules.
〘化･鉱〙 結晶(体)
Electronics a crystalline piece of semiconductor used as an oscillator or transducer.
a clear transparent mineral, especially quartz.
a piece of crystalline substance believed to have healing powers.
水晶製品, (装飾･宝石の)水晶(玉)
2. (also crystal glass) highly transparent glass with a high refractive index:
クリスタルガラス
e.g. as modifier : a crystal chandelier.
articles made of crystal glass:
〖集合的に〗クリスタルガラスの製品［食器類］(crystal glass).
e.g. a collection of crystal.
the glass over a watch face.
｟米｠ (時計の文字盤の)ガラス
3. informal short for crystal meth (methamphetamine).
｟くだけて｠ 粉末のメタンフェタミン(crystal meth)〘覚醒剤の一種〙
adjective
clear and transparent like crystal:
水晶(製)の, 水晶質の.
e.g. the clean crystal waters of the lake.
PHRASES
crystal clear
completely transparent and unclouded.
unambiguous; easily understood:
e.g. the house rules are crystal clear.
ORIGIN
late Old English (denoting ice or a mineral resembling it), from Old French cristal, from Latin crystallum, from Greek krustallos ‘ice, crystal’. The chemistry sense dates from the early 17th century.