ura·no·sphae·rite noun alsoura·no·sphe·rite\ˌyu̇rənōˈsfiˌrīt\ (-s) Etymology: German uranosphaerit, from uran- (II) + sphaer- + -it -ite : a mineral (BiO)2U2O7.3H2O that is a hydrous bismuth uranate and occurs in orange-yellow to brick-red half-globular aggregates