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malignant    : [məl'ɪgnənt]
Invasive \In*va"sive\, a. [LL. invasivus: cf. F. invasif. See
1. Tending to invade; characterized by invasion; aggressive.
"Invasive war." --Hoole.
[1913 Webster]

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.
[1913 Webster]

A malignant and a turbaned Turk. --Shak.
[1913 Webster]

2. Characterized or caused by evil intentions; pernicious.
"Malignant care." --Macaulay.
[1913 Webster]

Some malignant power upon my life. --Shak.
[1913 Webster]

Something deleterious and malignant as his touch.
[1913 Webster]

3. (Med.) Tending to produce death; threatening a fatal
issue; virulent; as, malignant diphtheria.
[1913 Webster]

{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}.
[1913 Webster PJC]

Malignant \Ma*lig"nant\, n.
1. A man of extreme enmity or evil intentions. --Hooker.
[1913 Webster]

2. (Eng. Hist.) One of the adherents of Charles I. or Charles
II.; -- so called by the opposite party.
[1913 Webster]

adj 1: dangerous to health; characterized by progressive and
uncontrolled growth (especially of a tumor) [ant:

157 Moby Thesaurus words for "malignant":
acrid, allergic, anemic, antagonistic, antipathetic, apoplectic,
arthritic, atrocious, baleful, baneful, barbaric, barbarous,
belligerent, bestial, bilious, bitchy, bitter, bloody, brutal,
brutish, cancerous, catching, caustic, chlorotic, clashing,
colicky, colliding, communicable, conflicting, consumptive,
contagious, corroding, corrosive, corrupting, corruptive,
counterproductive, cussed, damaging, deadly, death-bringing,
deathful, deathly, deleterious, despiteful, destructive,
detrimental, devilish, diabolical, disadvantageous, disserviceable,
distressing, dropsical, dyspeptic, edematous, encephalitic,
envenomed, epileptic, evil, fatal, feral, ferine, ferocious,
fiendish, fierce, full of hate, harmful, hateful, hostile, hurtful,
infectious, infective, inhuman, iniquitous, injurious, internecine,
invidious, kill-crazy, killing, laryngitic, leprous, lethal,
luetic, malarial, malefic, maleficent, malevolent, malicious,
malign, mean, measly, mephitic, merciless, miasmal, miasmatic,
miasmic, mischievous, mortal, murderous, nasty, nephritic,
neuralgic, neuritic, noisome, noncivilized, noxious, ominous,
ornery, palsied, paralytic, pernicious, pestiferous, pestilential,
phthisic, pitiless, pleuritic, pneumonic, pocky, podagric,
poisonous, prejudicial, quarrelsome, rachitic, rancorous,
repugnant, rheumatic, rickety, ruthless, sanguinary, savage,
scatheful, scorbutic, scrofulous, set against, sore, spiteful,
tabetic, tabid, tameless, toxic, toxicant, toxiferous, tubercular,
tuberculous, tumorigenic, tumorous, uncivilized, ungentle, untamed,
venenate, veneniferous, venenous, venomous, vicious, virulent,
vitriolic, wicked, wild

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