- lithium, Li, atomic number 3 - a soft silver-white univalent element of the alkali metal group; the lightest metal known; occurs in several minerals
--1 is a kind of metallic element, metal
--1 is a substance of lepidolite; amblygonite; spodumene; zinnwaldite - li - Chinese distance measure; approximately 0.5 kilometers
--2 is a kind of linear unit