\So"thi*ac\, Sothic \Soth"ic\, a.
Of or pertaining to Sothis, the Egyptian name for the Dog
Star; taking its name from the Dog Star; canicular.
{Sothiac}, or {Sothic}, {year} (Chronol.), the Egyptian year
   of 365 days and 6 hours, as distinguished from the
   Egyptian vague year, which contained 365 days. The Sothic
   period consists of 1,460 Sothic years, being equal to
   1,461 vague years. One of these periods ended in July, a.
   d. 139.