TRILINGUAL
trilingual
(adjective) using or knowing three languages; “trilingual speakers”
Source: WordNet® 3.1
Etymology
Adjective
trilingual (comparative more trilingual, superlative most trilingual)
Able to read or speak three languages.
Hypernym: multilingual
Expressed or written in three languages.
Hypernym: multilingual
Noun
trilingual (plural trilinguals)
A person who speaks three languages.
Source: Wiktionary
Tri*lin"gual, a. Etym: [L. trilinguis; tri- (see Tri-) + lingua
tongue, language. See Lingual.]
Definition: Containing, or consisting of, three languages; expressed in
three languages.
The much-noted Rosetta stone . . . bears upon its surface a
trilingual inscription. I. Taylor.
Source: Webster’s Unabridged Dictionary 1913 Edition