Search Result for "possum": 
Wordnet 3.0

NOUN (2)

1. nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America;
[syn: opossum, possum]

2. small furry Australian arboreal marsupials having long usually prehensile tails;
[syn: phalanger, opossum, possum]

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4 definitions retrieved:

The Collaborative International Dictionary of English v.0.48:

Opossum \O*pos"sum\, n. [Of N. American Indian origin.] (Zool.) Any American marsupial of the genera Didelphys and Chironectes; called also possum. The common species of the United States is Didelphys Virginiana. [1913 Webster] Note: Several related species are found in South America. The water opossum of Brazil (Chironectes variegatus), which has the hind feet, webbed, is provided with a marsupial pouch and with cheek pouches. It is called also yapock. [1913 Webster] Opossum mouse. (Zool.) See Flying mouse, under Flying. Opossum shrimp (Zool.), any schizopod crustacean of the genus Mysis and allied genera. See Schizopoda. [1913 Webster]
The Collaborative International Dictionary of English v.0.48:

Possum \Pos"sum\, n. [Shortened from opossum.] (Zool.) An opossum. [Colloq. U. S.] [1913 Webster] To play possum, To act possum, to feign ignorance, indifference or inattention, with the intent to deceive; to dissemble; -- in allusion to the habit of the opossum, which feigns death when attacked or alarmed. [1913 Webster]
WordNet (r) 3.0 (2006):

possum n 1: nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America [syn: opossum, possum] 2: small furry Australian arboreal marsupials having long usually prehensile tails [syn: phalanger, opossum, possum]
Moby Thesaurus II by Grady Ward, 1.0:

29 Moby Thesaurus words for "possum": Cape polecat, ape, bar, bear, cavy, chimp, chimpanzee, coon, ferret, foumart, glutton, groundhog, guinea pig, hedgehog, monk, monkey, mousehound, opossum, polecat, porcupine, prairie dog, quill pig, raccoon, skunk, weasel, whistle-pig, wolverine, woodchuck, zoril