SearchTruth is especially designed to search any word in the Quran and the Hadith.
The word(s) "trinity" appears 2 time(s) in 2 verse(s) in Quran in Abdullah Yusuf Ali translation.
(1) O People of the Book! Commit no excesses in your religion: Nor say of Allah aught but the truth. Christ Jesus the son of Mary was (no more than) a messenger of Allah, and His Word, which He bestowed on Mary, and a spirit proceeding from Him: so believe in Allah and His messengers. Say not "trinity": desist: it will be better for you: for Allah is one Allah: Glory be to Him: (far exalted is He) above having a son. To Him belong all things in the heavens and on earth. And enough is Allah as a Disposer of affairs.
(2) They do blaspheme who say: Allah is one of three in a trinity: for there is no god except One Allah. If they desist not from their word (of blasphemy), verily a grievous penalty will befall the blasphemers among them.