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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.
OPEN DICTIONARY PROJECT
Share your ideas for new words and new meanings of old words!
n. 1. Unselfish concern for the welfare of others; selflessness. 2. Zoology Instinctive behavior that is detrimental to the individual but favors the survival or spread of that individual's genes, as by benefiting its relatives. [French altruisme, probably from Italian altrui, someone else, from Latin alter, other; see al-1 in the Appendix of Indo-European roots.] altru·ist n. al′tru·istic adj. al′tru·isti·cal·ly adv. |
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Curious George's Dictionary
The American Heritage Children's Dictionary
The American Heritage Dictionary of Indo-European Roots
The American Heritage Student Grammar Dictionary
The American Heritage Desk Dictionary + Thesaurus
The American Heritage Science Dictionary
The American Heritage Dictionary of Business Terms
The American Heritage Student Dictionary
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