Definition of montmorillonoid in English:
montmorillonoid
adjective ˌmɒntməˈrɪlənɔɪd
Mineralogy Designating or relating to a group of clay minerals that comprises montmorillonite together with chemically related minerals which undergo a reversible expansion on absorbing water and have a characteristic structure in which water molecules are situated between sheets composed of two layers of silicon atoms sandwiching one nominally of aluminium, the differences between the minerals consisting in the extent and nature of the replacement of silicon and aluminium by other elements.
noun ˌmɒntməˈrɪlənɔɪd
Mineralogy A member of the montmorillonoid group; the group itself.
Origin
1950s; earliest use found in Clay Minerals Bulletin. From the name of Montmorillon + -oid, after montmorillonite.
Definition of montmorillonoid in US English:
montmorillonoid
adjectiveˌmɒntməˈrɪlənɔɪd
Mineralogy Designating or relating to a group of clay minerals that comprises montmorillonite together with chemically related minerals which undergo a reversible expansion on absorbing water and have a characteristic structure in which water molecules are situated between sheets composed of two layers of silicon atoms sandwiching one nominally of aluminium, the differences between the minerals consisting in the extent and nature of the replacement of silicon and aluminium by other elements.
nounˌmɒntməˈrɪlənɔɪd
Mineralogy A member of the montmorillonoid group; the group itself.
Origin
1950s; earliest use found in Clay Minerals Bulletin. From the name of Montmorillon + -oid, after montmorillonite.