perspicil

from The Collaborative International Dictionary of English v.0.48

Perspicil \Per"spi*cil\ (p[~e]r"sp[i^]*s[i^]l), n. [LL.
   perspicilla, fr. L. perspicere to look through.]
   An optical glass; a telescope. [Obs.] --Crashaw.
   [1913 Webster]