zero period
n.— «The new schedule has seven 50-minute periods, and extends the school day by 15 minutes. Before, the high school day had six 55-minute periods, but many students took an extra class —- commonly called a “zero period”—before the regular day began.» —“High school reform arrives” by Carolyn Norton Herald-Sun (Durham, North Carolina) Aug. 23, 2006. (source: Double-Tongued Dictionary)
Further reading
If you speak a second or third language, you may remember the first time you dreamed in that new tongue. But does this milestone mean you’re actually fluent? And a couple’s dispute over the word regret: Say you wish you’d been able...
For rock climbers, skiers, and other outdoor enthusiasts, the word send has taken on a whole new meaning. You might cheer on a fellow snowboarder with Send it, bro! — and being sendy is a really great thing. Plus: a nostalgic trip to Willa...