Glass (7)
'glass' is the definition.
(I know that crystal is a type of natural glass)
This is all the clue.
(Other definitions for crystal that I've seen before include "Clear material such as quartz" , "Regular-shaped mineral piece" , "Cut-glass" , "Highly-transparent glass" , "Type of clear-cut, lucent glass" .)
'glass' is the definition.
(I know that Tumbler is a glass)
This is all the clue.
(Other definitions for tumbler that I've seen before include "Drinking glass or old acrobat" , "Glass for whisky" , "A drop from a bar may occupy this" , "He performs feats" , "Stemless straight-sided glass" .)
'glass' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for beaker that I've seen before include "Glass container in a laboratory" , "Flatbottomed drinking cup" , "Tall cup or tumbler" , "Wide-mouthed cup" , "Small open glass with straight sides and a lip" .)