Definition of "sublingual" [sub•lin•gual]

• Situated beneath or on the underside of the tongue. (adjective)
• A sublingual part, such as a gland, artery, or 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.

• "WHITE: There's a lot of work that's being done with what we call sublingual immunotherapy."
• "It was looking at an alternative to allergy shots to build up an immunity against ragweed called sublingual immunotherapy."
• "So researchers have been testing needle-free alternatives, either in a daily tablet or as drops left under the tongue, which patients can self-administer at home -- so-called sublingual immunotherapy."