It is commonly called alumina, and may also be called aloxide, aloxite, or alundum depending on particular forms or applications. It commonly occurs in its crystalline polymorphic phase Î±-Al 2 O 3, in which it composes the mineral corundum, varieties of which form the precious gemstones ruby and sapphire.
rain cloud. (meteorology). Any cloud from which rain falls; a popular term having no technical denotation. 1  Facebook. 2  Twitter.
There is no general name for 'cloud' but there are different scientific names for different types of clouds, such as : alto, meaning middle and thus in the middle height of our atmosphere. Stratus, meaning sheet and layer like clouds. currulus meaning heap, usually looks like bunnies or castles in the sky.