ˈäləˌvēn, -_və̇n noun
( -s )
Etymology: German olivin, from olive + -in -ine — more at olivenite
1.
a. : a mineral (Mg,Fe) 2 SiO 4 consisting of a silicate of magnesium and iron and comprising the isomorphous series forsterite-fayalite that is used in making refractories ; broadly : a member of the isomorphous system (Mg,Fe,Mn,Ca) 2 SiO 4 including forsterite, fayalite, tephroite, and a hypothetical calcium orthosilicate — see peridot
b. : demantoid
2. : a light yellowish green that is yellower and paler than apple green (sense 2), lighter and stronger than pistachio, and deeper than ocean green