ˈlīməˌnīt noun
( -s )
Etymology: German limonit, from Greek leimōn meadow + German -it -ite — more at limb
: a naturally occurring hydrous ferric oxide that was formerly thought to be a distinct mineral 2Fe 2 O 3 .3H 2 O but that is now known to have a variable composition and to consist of a mixture of several minerals (as geothite, lepidocrocite, hematite) with or without presumably adsorbed additional water, that may in some cases be principally goethite and in other cases essentially ferric oxide gel, or that may be bog iron ore or a brown, yellow, or red ocher in which impurities are very common
• li·mo·nit·ic | ̷ ̷ ̷ ̷|nid.ik adjective