common opossum: omnivorous opossum of the eastern United States; noted for feigning death when in danger; esteemed as food in some areas; considered same species as the crab-eating opossum of South America
opossum: nocturnal arboreal marsupial having a naked prehensile tail found from southern North America to northern South America
triode: a thermionic vacuum tube having three electrodes; fluctuations of the charge on the grid control the flow from cathode to anode which makes amplification possible