(uncountable) The act of signing up or registering for something. / (countable) That which registers or makes something official, e.g. the form or paper that registers.

plural of arsenical

An often decorated or otherwise elaborated piece of wood or similar sturdy material to hit opponents in sports or dispute-settling rituals. / An elongate grip to move in a videogame.

simple past tense and past participle of blue-sky