astringent (redirected from astringencies)

astringent /astrin·gent/ (ah-strin´jent)

1. causing contraction, usually locally after topical application.

2. an agent that so acts.

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as·trin·gent (-strnjnt)

adj.

Causing contraction of tissues, arrest of secretion, or control of bleeding.

n.

A substance or preparation, such as alum, that draws together or constricts body tissues and is effective in stopping the flow of blood or other secretions.

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as·tringen·cy n.

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astringent

[əstrin′jənt]

Etymology: Gk, astringere, to tighten

1 a substance that causes contraction of tissues on application, usually used locally.

2 having the quality of an astringent. astringency, n.

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astringent,

n a substance that contracts or tightens tissue, thereby alleviating conditions such as diarrhea, hemorrhages, and secretions.

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astringent (strin´jnt),

n styptic; an agent that checks the secretions of mucous membranes and contracts and hardens tissues, limiting the secretions of glands.

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astringent

1. causing contraction or arresting discharges.

2. an agent that causes contraction or arrests discharges. Astringents act as protein precipitants; they arrest discharge by causing shrinkage of tissue.

Some astringents, such as tannic acid, have been used in treating diarrhea; others, such as boric acid and sodium borate, help relieve the symptoms of inflammation of the mucous membranes of the throat or conjunctiva of the eye. Skin lotions often contain astringents such as aluminum acetate that help to reduce oiliness and excessive perspiration. Witch hazel is a common household astringent used to reduce swelling. Styptic pencils, used to stop bleeding from small cuts, contain astringents. Zinc oxide and calamine are astringents used in lotions, powders and ointments to relieve itching and chafing in various forms of dermatitis. Astringents have some bacteriostatic properties, though they are not generally used as antiseptics.

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astringent 

A chemical substance that causes contraction of soft organic tissues by precipitating proteins from their surfaces. Astringents are incorporated into some artificial tears. Examples: acetylcysteine, witch hazel, zinc sulfate. See artificial tears.

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astringent

adjective Causing local contraction after topical application noun Pharmacology A topical agent–eg, aluminum-based compounds, used to precipitate proteins, as topical hemostatics, to ↓ mucosal inflammation, toughen skin, promote healing, as antiseptics, and as an antiperspirant