dioptase
noun
di·op·tase
dīˈäpˌtās,
-āz
plural -s
: a mineral CuSiO2(OH)2 consisting of hydrous copper silicate and occurring in emerald-green crystals and massive (hardness 5, specific gravity 3.47)
Word History
Etymology
French, probably from Late Greek dioptos transparent (from Greek dia- + optos visible, from opsesthai to be going to see) + French -ase (as in euclase)
- sick leave
- sick list
- sick nurse
- sick pay
- sick time
- sick to one's stomach
- sick up
- sick with worry
- sick-abed
- sick-out
- sick-outs
- sickbays
- sickbed
- sickbeds
- sicked
- sicked on
- sicked on someone or something
- sicked something on
- sicked something on someone or something
- sicked up
- sickees
- sicken
- sicken (with)
- sicken of
- sicken with