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| pertaining to an aromatic compound, which contains one or more benzene or equivalent heterocyclic rings: many such compounds have an agreeable odor |
| a salt of hydrofluoric acid consisting of fluorine, as sodium fluoride, NaF, or a compound containing fluorine, as methyl fluoride, CH3F |
lithium lith·i·um (lĭth'ē-əm)
n.
Symbol Li
A soft, highly reactive metallic element. Atomic number 3; atomic weight 6.941; melting point 180°C; boiling point 1,342°C; specific gravity 0.534; valence 1.
| lithium (lĭth'ē-əm) Pronunciation Key
Symbol Li A soft, silvery metallic element of the alkali group that occurs in small amounts in some minerals. It is the lightest of all metals and is highly reactive. Lithium is used to make alloys, batteries, glass for large telescopes, and ceramics. Atomic number 3; atomic weight 6.941; melting point 179°C; boiling point 1,317°C; specific gravity 0.534; valence 1. See Periodic Table. |