Somme (sŏm, sôm)
A river, about 245 km (150 mi) long, of northern France flowing west and northwest to the English Channel. Tanks were first used in warfare during the devastating Battle of the Somme (1916).
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.