fe·ri·a (fîrē-ə, fĕr-)
n. pl. fe·ri·as or fe·ri·ae (-ē-ē′)
A weekday on a church calendar on which no feast is observed.
[Medieval Latin fēria, ordinary day, weekday, from Late Latin, feast day (used with ordinals to name the days of the week), from Latin fēriae, religious festival, holidays; see dhēs- in the Appendix of Indo-European roots.]
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Indo-European & Semitic Roots Appendices
Thousands of entries in the dictionary include etymologies that trace their origins back to reconstructed proto-languages. You can obtain more information about these forms in our online appendices:
The Indo-European appendix covers nearly half of the Indo-European roots that have left their mark on English words. A more complete treatment of Indo-European roots and the English words derived from them is available in our Dictionary of Indo-European Roots.