on tip ones tongue

Science Dictionary
tongue   (tŭng)  Pronunciation Key 
  1. A muscular organ in most vertebrates that is usually attached to the bottom of the mouth. In snakes, the tongue is used as a sense organ. In frogs, the tongue is chiefly used to capture prey. In mammals, the tongue is the main organ of taste and is an important organ of digestion. In humans, the tongue is used to produce speech.

  2. A similar organ in certain invertebrate animals.


The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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