D defs.my
Entry 1 sense Webster, 1913

Nova

/(nō"vȧ)/ · No·va · IPA /ˈnoʊ.və/
01 n. A star which suddenly increases in brightness thousands of times, then fades back to near its original intensity. It may appear as a “new”…
pl. Novae, Novas ((nō"vē))
  1. 1.
    A star which suddenly increases in brightness thousands of times, then fades back to near its original intensity. It may appear as a “new” star if its original brightness was too low for routine observation. A star which suddenly increases in brightness to many millions of times its original intensity is a supernova, and the postulated mechanisms for the increases of brightness of novae and supernovae are different.(Astron.) See: supernova