According to Etymonline, ammo has been used as a shortened form of ammunition since 1917. Why does the shortened version end in o instead of u? The only reason I can think of is that it matches other shortened forms like info and photo, but information and photograph actually have an o in them, so I'm not sure that's it. Does anyone have any insight into this?
Why is "ammunition" shortened to "ammo" and not "ammu"?
Nicole
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