[ zwĭt′ər-ī′ən, swĭt′-, tsvĭt′- ]
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A molecule, especially an amino acid, containing a positively charged ion at one end and a negatively charged ion at the other.
SHALL WE PLAY A "SHALL" VS. "SHOULD" CHALLENGE?
Should you take this quiz on “shall” versus “should”? It should prove to be a quick challenge!
Question 1 of 6
Which form is used to state an obligation or duty someone has?
Words nearby zwiterrion
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.