Plural of grampus; multiple large marine mammals of the whale or dolphin family, or multiple grumpy people.
Regular English plural of grampus, formed by adding -es; maintains the etymological connection to the French-Latin roots while adapting to English morphology.
The plural 'grampuses' reveals something odd about English—we could have pluralized this French loanword as 'grampusses' or kept the French plural, but instead created this hybrid form that shows the word's integrated status in English.
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