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Mis·sis·sip·pi·an (mĭsĭ-sĭpē-ən)
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adj.
1. Of or relating to the state or residents of Mississippi or the Mississippi River.
2. Of, relating to, or being the period of geologic time from about 359 to 318 million years ago, the fifth period of the Paleozoic Era. The Mississippian Period is characterized by the submergence of extensive land areas under shallow seas and by the appearance of primitive conifers. See Table at geologic time.
3. Of or relating to a Native American culture flourishing throughout the southern Mississippi Valley and much of southeastern North America from about 1000 AD until contact with Europeans, characterized especially by the establishment of permanent towns, settled agriculture, regional chiefdoms, and the construction of large earthworks serving as ceremonial centers.
n.
1. A native or resident of Mississippi.
2. The Mississippian Period. Also called Lower Carboniferous.

[Adj., sense 2, and n., sense 2, from the fact that rocks dating from the period are exposed in the Mississippi Valley.]

The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2020 by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
 

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:

    Indo-European Roots

    Semitic Roots

    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.

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