1) Period 2) Period of time 3) Time period 
of, like or pertaining to the dog star
• (a.) Pertaining to, or measured, by the rising of the Dog Star.
Ca·nic'u·lar adjective [ Latin canicularis ; confer French caniculaire .] Pertaining to, or measured, by the rising of the Dog Star. Canicular days , 
[adj] - of or relating to the dog days of summer 2. [adj] - relating to or especially immediately preceding or following the heliacal rising of Canicula (the Dog Star)
canicular 1. Of or relating to the dog days of summer: 'The canicular heat of the Deep South.' 2. Relating to or especially immediately preceding or following the heliacal rising of Canicula (the Dog Star); 'canicular days.' 3. Etymology: Latin canicularis through French caniculaire.
adjective relating to or especially immediately preceding or following the heliacal rising of Canicula (the Dog Star); `canicular days`