e-day
n.— «She is looking into the possibility of offering an extra Friday program. Coined an E-Day (extra, enhancement or experiment), the course would be offered the Friday that kindergarten students do not have class. Although still in its infancy, Arnebeck envisioned the program as a class of 24 students engaging in hands-on activities.» —“Hibbing School cuts made” by Kelly Grinsteinner Daily Tribune (Hibbing, Minn.) Apr. 14, 2005. (source: Double-Tongued Dictionary)
Further reading
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There are eight major planets, but more than a million minor ones, including asteroids. If you discover one, you get the honor of naming it. The Dictionary of Minor Planet Names includes minor planets named for rock bands, jazz musicians, poets, and...