Wiktionary
omnilingual
a. Having the ability to speak, or to understand, all languages n. A person with such an ability
Wikipedia
Omnilingual
"Omnilingual" is a science fiction short story written by H. Beam Piper. This short story was originally published in the February 1957 issue of Astounding Science Fiction. This short story is unusual in focussing on the problem of archaeology on an alien culture.
Usage examples of "omnilingual".
She itched to have her hands on one of the omnilingual translation units so common on far-off Sentinel Gate—and so rare on a poor world like Opal.