Definition of "vas deferens" [vas deferens]

• The main duct through which semen is carried from the epididymis to the ejaculatory duct. (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.

• "After the opiate effect wore off, Hughes applied a small amount of “X” to the vas deferens tissues, and found that this natural compound was a much more powerful inhibitor of muscular contraction than normorphine had been."