n. Symbol Li
1. A soft, silvery, highly reactive element that is an alkali metal and is used as a heat transfer medium, in thermonuclear weapons, and in batteries, lubricants, various alloys, ceramics, and optical glass. Atomic number 3; atomic weight 6.941; melting point 180.5°C; boiling point 1,342°C; specific gravity 0.534; valence 1. See Periodic Table.
2. Any of several salts of lithium, especially lithium carbonate.
The American Heritage® Dictionary of the English Language, Fifth Edition copyright ©2022 by HarperCollins Publishers. All rights reserved.
Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.