ˈnivəˌnīt noun
( -s )
Etymology: William Niven died 1937 American mineralogist + English -ite
: a velvet-black variety of uraninite containing cerium and yttrium
ˈnivəˌnīt noun
( -s )
Etymology: William Niven died 1937 American mineralogist + English -ite
: a velvet-black variety of uraninite containing cerium and yttrium
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012