Those unpleasant stains around your armpits — that's an exudation, dude — the release of a bodily liquid through your skin.

In general an exudation is pretty smelly stuff: sweat, oil and various other discharges we can't mention on a family site. Plants and animals create their own exudations too. Funnily enough, while the noun exudation almost always refers to a physical discharge of fluid, the verb, to exude has a far more figurative meaning. Sure, you can exude bad smells or liquids, but you can also exude good will, bonhomie, love and just about any other emotion you can think of.

Definitions of exudation
  1. noun
    the process of exuding; the slow escape of liquids from blood vessels through pores or breaks in the cell membranes
    synonyms: transudation
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    type of:
    ooze, oozing, seepage
    the process of seeping
  2. noun
    a substance that oozes out from plant pores
    synonyms: exudate
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    any of various substances (soluble in water) that exude from certain plants; they are gelatinous when moist but harden on drying
    a milky exudate from certain plants that coagulates on exposure to air
    liquidambar, sweet gum
    aromatic exudate from the sweet gum tree
    eucalyptus gum, eucalyptus kino, red gum
    reddish-brown dried gummy exudation from any of several trees of the genus Eucalyptus especially Eucalyptus camaldulensis
    balata, gutta balata
    when dried yields a hard substance used e.g. in golf balls
    ammoniac, gum ammoniac
    the aromatic gum of the ammoniac plant
    carrageenan, carrageenin
    a colloidal extract from carrageen seaweed and other red algae
    a gum resin from the poison hemlock, Conium maculatum
    dragon's blood
    a dark red resinous substance derived from various trees and used in photoengraving
    euphorbium, gum eurphorbium
    an acrid brown gum resin now used mainly in veterinary medicine
    frankincense, gum olibanum, olibanum, thus
    an aromatic gum resin obtained from various Arabian or East African trees; formerly valued for worship and for embalming and fumigation
    galbanum, gum albanum
    a bitter aromatic gum resin that resembles asafetida
    ghatti, ghatti gum
    an Indian gum from the dhawa tree; used as a substitute for gum arabic
    agar, agar-agar
    a colloidal extract of algae; used especially in culture media and as a gelling agent in foods
    algin, alginic acid
    a gum used especially as a thickener or emulsifier
    cherry-tree gum
    exudation from trees of the Prunus genus; resembles gum arabic
    chicle, chicle gum
    gum-like substance from the sapodilla
    guar gum
    a gum from seeds of the guar plant; used to thicken foods and as sizing for paper and cloth
    gum acacia, gum arabic
    gum from an acacia tree; used as a thickener (especially in candies and pharmaceuticals)
    Bengal kino, butea gum, butea kino, gum butea
    dried juice of the dhak tree; used as an astringent
    gum kino, kino, kino gum
    a gum obtained from various tropical plants; used as an astringent and in tanning
    mesquite gum
    a gum obtained from mesquite pods; resembles gum arabic
    a gelatinous substance secreted by plants
    karaya gum, sterculia gum
    exudate of an Asian tree; used for finishing textiles and to thicken foodstuffs and cosmetics
    a whitish rubber derived from the coagulated milky latex of gutta-percha trees; used for insulation of electrical cables
    a black resinous substance obtained from certain trees and used as a natural varnish
    an odorous gum resin formerly used in medicines
    India rubber, caoutchouc, gum elastic, natural rubber, rubber
    an elastic material obtained from the latex sap of trees (especially trees of the genera Hevea and Ficus) that can be vulcanized and finished into a variety of products
    gum sangapenum, sangapenum
    a variety of gum
    a gum used in pharmacy, adhesives, and textile printing
    type of:
    discharge, emission
    a substance that is emitted or released
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