D defs.my
Entry 2 senses Webster, 1913

Perspicacious

/(pẽr`spĭ*kā"shŭs)/ · Per·spi·ca·cious · IPA /ˌpɜːɹ.spɪˈkeɪ.ʃəs/
01 a. Having the power of seeing clearly; quick-sighted; sharp of sight.
  1. 1.
    Having the power of seeing clearly; quick-sighted; sharp of sight.
  2. 2.
    Fig.: Of acute discernment; keen.