Antiptosis :: Antiptosis (n.) The putting of one case for another.
Leptostraca :: Leptostraca (n. pl.) An order of Crustacea, including Nebalia and allied forms..
Metemptosis :: Metemptosis (n.) The suppression of a day in the calendar to prevent the date of the new moon being set a day too late, or the suppression of the bissextile day once in 134 years. The opposite to this is the proemptosis, or the addition of a day every 330 years, and another every 2,400 years..