- Any of various chiefly tropical marine gastropod mollusks of the family Cymatiidae, having a pointed, spirally twisted, often colorfully marked shell. (noun)
- The nucleus of tritium, consisting of two neutrons and one proton. (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.