Agendum :: Agendum (n.) Something to be done; in the pl., a memorandum book..
Agendum :: Agendum (n.) A church service; a ritual or liturgy. [In this sense, usually Agenda.].
Corrigendum :: Corrigendum (n.) A fault or error to be corrected.
Corundum :: Corundum (n.) The earth alumina, as found native in a crystalline state, including sapphire, which is the fine blue variety; the oriental ruby, or red sapphire; the oriental amethyst, or purple sapphire; and adamantine spar, the hair-brown variety. It is the hardest substance found native, next to the diamond..
Dumb-bell :: Dumb-bell (n.) A weight, consisting of two spheres or spheroids, connected by a short bar for a handle; used (often in pairs) for gymnastic exercise..
Dumb-waiter :: Dumb-waiter (n.) A framework on which dishes, food, etc., are passed from one room or story of a house to another; a lift for dishes, etc.; also, a piece of furniture with movable or revolving shelves..
Dumbledor :: Dumbledor (n.) A bumblebee; also, a cockchafer..