heortology
noun
- the science or study of the origin, meaning, growth, and history of the religious feasts and seasons of the Christian year
Wiktionary
noun
Etymology: From German Heortologie, from Ancient Greek ἑορτή (heortḗ, “festival”) + -ology.
- The study of religious festivals.
“For the same reason, in accordance with the meaning of the term "Heortology," he has concerned himself with those festivals alone which are publicly celebrated, or were so celebrated formerly.”