Word Study
blue-green |
blue-green alga |
blue-green algae |
blue-grey |
blue-headed vireo |
blue-john
| blue-lilac
| blue-pencil
| blue-purple
| blue-ribbon
| blue-sky
blue-john
CIDE DICTIONARY
blue-john, n.
A name given to fluor spar in Derbyshire, where it is used for ornamental purposes. [1913 Webster]
For further exploring for "blue-john" in Webster Dictionary Online