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pack ratPsychiatry A person who hoards objects of little worth–eg, string, old newspapers, etc–and lacking sentimental value; the PR mentality is typical of OCD. Cf Obsessive-compulsive disorder.
small, furred mammal; members of the family Murinae (Old World rats) and the family Cricetinae (New World rats) both of the order Rodentia. They are omnivorous, nocturnal, do not hibernate and live commensally with humans. They have pointed snouts, a long, thin, almost hairless tail. Only some of the members of the rat and allied groups are listed below.
rat bite fever
Old World rat with long tail and ears. Called also Rattus rattus.
Old World rat with short tail and ears. Called also Rattus norvegicus.
see leptopsylla segnis.
a solitary rodent with long legs with which it progresses in leaps like a kangaroo and uses its large tail as a balancer. Called also Dipodomys deserti.
a chronic, largely cutaneous disease of rats caused by Mycobacterium lepraemurium and characterized by subcutaneous granuloma and similar involvement of superficial lymph nodes, containing large numbers of acid-fast organisms. The disease has little similarity to nor any relationship with human leprosy. See also feline leprosy.
laboratory rat with brown or black head and shoulders.
properly called muskrat and is really a water vole. Called also Ondatra zibethica.
New World rat-like creature. Called also Neotoma spp., wood rat.
albino laboratory rat.
rat tooth, teeth
describes the type of points on surgical instruments with a single point on one side which interlocks with two points on the other side.
properly called water vole; in Australia, water rat is a native rodent Hydromys chrysogaster.
common laboratory rat.
a white laboratory rat.