| MAS | the Algonquian language of the Massachuset people |
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| MAS | a member of the Algonquian people who formerly lived around Massachusetts Bay |
| MAS | the Algonquian language of the Massachuset people |
| MAS | a state in New England |
| MAS | one of the British colonies that formed the United States |
| MAS | a member of the Algonquian people who formerly lived around Massachusetts Bay |
| MAS | an inlet of the Atlantic Ocean off of eastern Massachusetts extending from Cape Ann on the north to Cape Cod on the south |
| MAS | one of the British colonies that formed the United States |
| MAS | delicate feathery shield fern of the eastern United States |
| MAS | an engineering university in Cambridge |
| MAS | the savage and excessive killing of many people |
| MAS | kill a large number of people indiscriminately |