Definition of "tetravalent" []

• Having valence 4. (adjective)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Since there are four distinct dengue viruses, the challenge is to concoct a four-way, or "tetravalent," vaccine, effective against all strains at once."
• "The new vaccine is tetravalent, meaning that it is designed to protect against all four dengue viruses, also called serotypes."
• "Every node in this graph was tetravalent: connected by four edges to four other nodes."