Origin of lobster
- Middle English lopster, lobstere from Old English loppestre alteration (perhaps influenced by loppe, lobbe spider) of Latin locusta locust (grasshopper), lobster
From American Heritage Dictionary of the English Language, 5th Edition
- From Middle English lopster (“lobster"), from Old English loppestre (“lobster, spider-like creature"), believed to be a corruption of Latin locusta (“lobster, locust") + the Old English feminine agent suffix -estre; or from Old English lobbe, loppe (“spider") + the Old English feminine agent suffix -estre, equivalent to lop +"Ž -ster. More at lop.