fergason | |
ferguson | |
ferguson's |
ferguson | |
ferguson's |
fergusonite | (n) a dark mineral consisting of oxides of yttrium and erbium and tantalum and other minerals |
Fergusonite | n. (Min.) A mineral of a brownish black color, essentially a tantalo-niobate of yttrium, erbium, and cerium; -- so called after Robert Ferguson. [ 1913 Webster ] |