You searched for: “terras irradient”
They will enlighten [many] lands.
Motto of Amherst College, Amherst, Massachusetts, USA. Also translated as, "Let them illuminate the lands." Also, "May they illumine the earth."
This entry is located in the following units: Latin Proverbs, Mottoes, Phrases, and Words: Group T (page 2) terr-, terra-, -ter (page 4)