(chemistry) a binary compound of lithium and sulfur, Li₂S, sometimes used in lithium batteries

(chemistry) the lithium salt of stearic acid; a lithium soap made from tallow

(chemistry) The lithium salt of carbonic acid, Li₂CO₃, used in the manufacture of glass and ceramics, and medically, in the treatment of bipolar disorder.

(chemistry) a white, powdered alkali, Li₂O, used in the manufacture of glass and ceramics

(chemistry) A binary compound of lithium and nitrogen, Li₃N.

(computing) able to operate a personal computer and its associated software and hardware, and to understand most of the underlying concepts (but not necessarily the electronics, or a programming language)

(computing) the ability to operate a personal computer and its associated software and hardware, and to understand most of the underlying concepts (but not necessarily the electronics, or a programming language)

Alternative spelling of lithium aluminium hydride

(chemistry) A simple test for the acidity or alkalinity of a substance, using litmus paper.

Lithuanian Soviet Socialist Republic, the name for the Republic of Lithuania while under the rule of the Soviet Union (1940-1991, name changed in 1990).