passive(redirected from passive cutaneous anaphylaxis (PCA) test)
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Related to passive cutaneous anaphylaxis (PCA) test: passive cutaneous anaphylaxis test
grammatical category according to which an action is referred to as done by the subject (active, e.g., men shoot bears) or to the subject (passive, e.g., bears are shot by men). In Latin, voice is a category of inflection like mood or tense.
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1. Chem (of a substance, esp a metal) apparently chemically unreactive, usually as a result of the formation of a thin protective layer that prevents further reaction
2. Electronics Telecomm
a. containing no source of power and therefore capable only of attenuating a signal
b. not capable of amplifying a signal or controlling a function