People who operate guns or artillery weapons, or soldiers trained to fire large weapons.
From 'gun' plus the suffix '-er' (one who does something). The word 'gun' has uncertain origins but possibly comes from a Scandinavian word or a lady's name ('Gunilda') applied to an early cannon.
The term 'gunner' became respectable and specialized—medieval gunners were among the first technical specialists in armies, requiring education in mathematics and chemistry, making them early STEM experts.
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