Source : Webster's Revised Unabridged Dictionary (1913)

Sillyhow \Sil"ly*how\, n. [Prov. E. silly-hew; cf. AS. s[=ae]lig
   happy, good, and h[=u]fe a cap, hood. See {Silly}, a.]
   A caul. See {Caul}, n., 3. [Obs. or Prov. Eng. & Scot.]