semiquintile

from The Collaborative International Dictionary of English v.0.48

Semiquintile \Sem"i*quin`tile\ (s[e^]m"[i^]*kw[i^]n`t[i^]l), n.
   (Astrol.)
   An aspect of the planets when distant from each other half of
   the quintile, or thirty-six degrees.
   [1913 Webster]