#agent  an active and efficient cause; capable of producing a certain effect; "their research uncovered new disease agents"
  supertype:  #causal_agent__cause__causal_agency  any entity that causes events to happen
  subtype:  #vasoconstrictor__vasoconstrictive  any agent that causes a narrowing of an opening of a blood vessel: cold or stress or nicotine or epinephrine or norepinephrine or angiotensin or vasopressin or certain drugs; maintains or increases blood pressure
     subtype:  #adrenergic_drug__adrenergic  drug that has the effects of epinephrine
        subtype:  #phenylephrine  a powerful vasoconstrictor used to dilate the pupils and relieve nasal congestion
        subtype:  #phenylpropanolamine  an adrenergic drug used in many preparations to relieve allergic reactions or respiratory infections
     subtype:  #angiotensin__angiotonin__Hypertensin  any of several vasoconstrictor substances (trade name Hypertensin) that cause narrowing of blood vessels
        subtype:  #angiotensin_I  a physiologically inactive form of angiotensin that is the precursor to angiotensin II
        subtype:  #angiotensin_II  a potent vasopressor agent formed from angiotensin I
     subtype:  #lypressin  an antidiuretic and vasoconstrictor used to treat diabetes insipidus
     subtype:  #naphazoline__Privine__Sudafed  vasoconstrictor (trade names Privine and Sudafed) used in nasal sprays to treat symptoms of nasal congestion and in eyedrops to treat eye irritation
     subtype:  #vasopressor  any agent that produces vasoconstriction and a rise in blood pressure (usually understood as increased arterial pressure)
     subtype:  #low_temperature__coldness__cold  the absence of heat; "the coldness made our breath visible"; "come in out of the cold"; "cold is a vasoconstrictor"
        subtype:  #iciness__icines__gelidity  coldness due to a cold environment
        subtype:  #chilliness__coolness  the property of being moderately cold; "the chilliness of early morning"
        subtype:  #frostiness  coldness as evidenced by frost
        subtype:  #cool  the quality of being cool: "the cool of early morning"
     subtype:  #noradrenaline  a catecholamine precursor of epinephrine that is secreted by the adrenal medulla and also released at synapses
     subtype:  #epinephrine__epinephrin__adrenaline__Adrenalin  a catecholamine secreted by the adrenal medulla in response to stress (trade name Adrenalin); stimulates autonomic nerve action
     subtype:  #vasopressin__antidiuretic_hormone__ADH__Pitressin  hormone secreted by the posterior pituitary gland (trade name Pitressin) and also by nerve endings in the hypothalamus; affects blood pressure by stimulating capillary muscles and reduces urine flow by affecting reabsorption of water by kidney tubules
     subtype:  #nicotine  an alkaloid poison that occurs in tobacco; used in medicine and as an insecticide
  subtype:  #eliminator  an agent that eliminates something
     subtype:  #obliterator  an eliminator that does away with all traces
  subtype:  #impairer  an agent that impairs; "crops can be great impairers of the soil"
  subtype:  #mutagen  any agent (physical or environmental) that can induce a genetic mutation or can increase the rate of mutation
  subtype:  #quickener__enlivener  an agent that gives or restores life or vigor; "the soul is the quickener of the body"
  subtype:  #relaxer  any agent that produces relaxation; "music is a good relaxer"
  subtype:  #repressor__represser  an agent that represses
  subtype:  #satisfier  any agent capable of producing satisfaction
  subtype:  #shortener  any agent that shortens; "alcohol is a great shortener of life"
  subtype:  #stressor  any agent that causes stress to an organism
  subtype:  #teratogen  any agent that interferes with normal embryonic development: alcohol or thalidomide or X-rays or rubella are examples
     subtype:  #thalidomide  a sedative and hypnotic drug; withdrawn from sale after discovered to cause severe birth defects because it inhibits angiogenesis
  subtype:  #vector.agent__transmitter  any agent (person or animal or microorganism) that carries and transmits a disease; "mosquitos are vectors of malaria and yellow fever"; "fleas are vectors of the plague"; "aphids are transmitters of plant diseases"
     subtype:  #immune_carrier__carrier  a person who has some pathogen to which they are immune but who can pass it on to others
        instance:  #Mary_Mallon__Mallon__Typhoid_Mary
  subtype:  #weakener  that which weakens or causes a loss of strength; "doubt is a great weakener of resolve"

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