|1.||the hot period of the summer reckoned in ancient times from the heliacal rising of Sirius (the Dog Star)|
|2.||a period marked by inactivity|
|[C16: translation of Late Latin diēs caniculārēs, translation of Greek hēmerai kunades]|
The hot, muggy days of summer. The Romans associated such weather with the influence of Sirius, the dog star, which is high in the sky during summer days.