semipellucidity

from The Collaborative International Dictionary of English v.0.48

Semipellucidity \Sem`i*pel`lu*cid"i*ty\
   (s[e^]m`[i^]*p[e^]l`l[-u]*s[i^]d"[i^]*t[y^]), n.
   The quality or state of being imperfectly transparent.
   [1913 Webster]