Usually means: Primary channel of a river.
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We found 4 dictionaries that define the word mainstem:

General (3 matching dictionaries)
  1. mainstem: Wordnik
  2. mainstem: Wiktionary
  3. Mainstem (hydrology), Mainstem: Wikipedia, the Free Encyclopedia

Tech (1 matching dictionary)
  1. Lake and Water Word Glossary (No longer online)

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Definitions from Wiktionary (mainstem)

▸ noun:  The principal watercourse of a river that has multiple streams

Similar:
midstream, understream, trunk line, influent, mid-stream, mainline, tributary, anabranch, instream, trunk, more...

Opposite:
tributary, branch, offshoot, feeder

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Similar:
midstream, understream, trunk line, influent, mid-stream, mainline, tributary, anabranch, instream, trunk, more...

Opposite:
tributary, branch, offshoot, feeder



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