ahemeral

ahemeral

(æˈhɛmərəl; eɪ-)
adj
not constituting a full 24-hour day
[C20: from Greek a- not + hēmera a day]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014