English word trilithium comes from English lithium, English tri-
| Dictionary entry | Language | Definition |
|---|---|---|
| lithium | English (eng) | (pharmaceutical drug, uncountable) Lithium carbonate or other preparations of lithium metal used to treat manic depression and bipolar disorders.. (uncountable) The simplest alkali metal, the lightest solid element, and the third lightest chemical element (symbol Li) with an atomic number of 3.. A lithium battery. |
| tri- | English (eng) | (chemistry) Used in combination with a known element name (e.g. 'tri-silicon') to designate an unknown element that would reside three periods lower than the known element on a Mendeleev-type periodic table. See Mendeleev's predicted elements. Three. |
| trilithium | English (eng) | (chemistry, especially in combination) Three lithium atoms in a molecule. |