Mixer comes from the English word for "mixer or blender."
It comes from the verb (to) mix, meaning to mix or blend.
In the culinary field, the term mixer refers to:
An electrical appliance equipped with one or two rotating whisks, capable of mixing, chopping, and blending one or more ingredients or preparations.
A blender, often an immersion blender, used to chop and/or mix foods.
A graduated glass or crystal container into which the ingredients of a drink or cocktail are poured for thorough mixing. The cocktail mixer is complete with a long mixing spoon and a strainer to prevent ice from falling into the glass when pouring the cocktail.