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The Collaborative International Dictionary of English v.0.48 (gcide)

Invasive \In*va"sive\, a. [LL. invasivus: cf. F. invasif. See
{Invade}.]
1. Tending to invade; characterized by invasion; aggressive.
"Invasive war." --Hoole.
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2. (Med.) tending to spread, especially tending to intrude
into healthy tissue; -- used mostly of tumors. [Narrower
terms: {malignant}] PJC]


malignant \ma*lig"nant\, a. [L. malignans, -antis, p. pr. of
malignare, malignari, to do or make maliciously. See
{Malign}, and cf. {Benignant}.]
1. Disposed to do harm, inflict suffering, or cause distress;
actuated by extreme malevolence or enmity; virulently
inimical; bent on evil; malicious.
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A malignant and a turbaned Turk. --Shak.
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2. Characterized or caused by evil intentions; pernicious.
"Malignant care." --Macaulay.
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Some malignant power upon my life. --Shak.
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Something deleterious and malignant as his touch.
--Hawthorne.
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3. (Med.) Tending to produce death; threatening a fatal
issue; virulent; as, malignant diphtheria.
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{Malignant pustule} (Med.), a very contagious disease
produced by infection of subcutaneous tissues with the
bacterium {Bacillus anthracis}. It is transmitted to man
from animals and is characterized by the formation, at the
point of reception of the infection, of a vesicle or
pustule which first enlarges and then breaks down into an
unhealthy ulcer. It is marked by profound exhaustion and
often fatal. The disease in animals is called {charbon};
in man it is called {cutaneous anthrax}, and formerly was
sometimes called simply {anthrax}.
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Malignant \Ma*lig"nant\, n.
1. A man of extreme enmity or evil intentions. --Hooker.
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2. (Eng. Hist.) One of the adherents of Charles I. or Charles
II.; -- so called by the opposite party.
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