Definition of "pathway" []

• A path. (noun)
• Physiology A course usually followed by a body part or process. (noun)
• Physiology A chain of nerve fibers along which impulses normally travel. (noun)
• Physiology A sequence of enzymatic or other reactions by which one biological material is converted to another. (noun)

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.

• "And even more than the qualifiers it already gives, the page reminds us that "The carbohydrate - tryptophan - serotonin pathway is simply a hypothesis at this point.""
• "Your use of the term pathway is much too generous."
• "Obama says people who are here illegally should be given what he calls pathway to legalization."