1. A condition of not being active and having very little energy: "The news about the earthquake aroused him from his torpor and as a result, he became more aware of what was happening."
2. A state of mental or physical inactivity or insensibility: "Mike was experiencing significant torpor after working for two days without any sleep."
3. A situation in which an organism is inactive and it might be a result of damage to the nervous system or it might be a natural reaction to conserve energy: "Some mosquitoes pass the winter in a state of torpor so they can survive freezing temperatures."

1. Estivation or dormancy in some animals during the heat of the summer or during months of drought: "Animals; such as, snakes and lizards often enter a state of summer torpor during the hottest part of the days."
2. An inactive condition resembling deep sleep, in which some animals living in hot climates; such as, how certain snails pass the summer: "Estivation or the cessation or slowing of activity protects these creatures against heat and dryness during their summer torpor."
3. The arrangement of petals in a flower before it opens; prefloration: "The tight bud or summer torpor of the roses is a sign that they are about to burst into full bloom."

Reduced sensitivity of the retina of the eyes to normal light stimuli: "The patient's torpor retinae was being carefully monitored by the ophthalmologist."

1. Hibernation or to be in an inactive or dormant (sleep) condition or period: "Many mammals; such as, bears often enter a state of winter torpor during the cold season."
2. An inactive condition resembling deep sleep in which certain animals living in cold climates pass the winter: "In hibernation, the body temperature is lowered and breathing and heart rates slow down. Winter torpor protects certain animals from cold and reduces the need for food during the season when food is scarce or unavailable."