Bible Dictionaries
Theta

Webster's Dictionary

(n.) A letter of the Greek alphabet corresponding to th in English; - sometimes called the unlucky letter, from being used by the judges on their ballots in passing condemnation on a prisoner, it being the first letter of the Greek qa`natos, death.

Bibliography Information
Webster, Noah. Entry for 'Theta'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​t/theta.html. 1828.