D defs.my
Entry 1 sense Webster, 1913

Pittacal

/(pĭt"tȧ*kăl)/ · Pit·ta·cal · IPA
01 n. A dark blue substance obtained from wood tar. It consists of hydrocarbons which when oxidized form the orange-yellow eupittonic compounds, …
  1. 1.
    A dark blue substance obtained from wood tar. It consists of hydrocarbons which when oxidized form the orange-yellow eupittonic compounds, the salts of which are dark blue.(Chem.)