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From The Collaborative International Dictionary of English v.0.48:
Canicular \Ca*nic"u*lar\, a. [L. canicularis; cf. F. caniculaire.] Pertaining to, or measured, by the rising of the Dog Star. [1913 Webster] Canicular days, the dog days, See Dog days. Canicular year, the Egyptian year, computed from one heliacal rising of the Dog Star to another. [1913 Webster]