major salivary gland

n.
  1. Any of three salivary glands, the parotid gland, the submandibular gland, and the sublingual gland, which are the largest of the oral cavity and secrete the most saliva.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.