"Mice" is the plural of mouse, the animal. So far there's no official parlance for the plural of mouse, the input device; the fact that "mice" is specifically a conjugation which refers to the plural of an animal with an -ouse sound (such as louse/lice) makes some grammaticians a bit worrisome about the further corruption of English, even though English is a connotative language. As such, some of them encourage the use of the kludgy and cumbersome term "mouses" instead. I personally prefer to take the cop-out approach and say "mouse input devices" so as to avoid any potential grammar vs. namespace conflict.

"Mousies" is the plural of "mouse", as in "I have these two three-button mousies just in case I spill the grapefruit juice on one". This avoids the awkward situation of calling it the same thing as a plural of the rodent.

"Mouses" is what a mouser does - think Tom and Jerry: Tom is a mouser. He mouses. He mouses Jerry and any other meece (meeces?) that might populate the dwelling.

Coffee, please! Not lucid yet!

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