Etymology
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plaster (n.)

late Old English plaster "a medicinal solid compounded for external application," from medical Latin plastrum, shortened by loss of the original prefix from Latin emplastrum "a plaster" (in the medical as well as the building sense), from Greek emplastron "salve, plaster" (used by Galen instead of the more usual emplaston), noun use of neuter of emplastos "daubed on," from en- "on" + plastos "molded," verbal adjective from plassein "to mold" (see plasma).

The use in reference to the material composed of lime, water, and sand (with or without hair for binding), used for coating walls, is recorded in English from c. 1300, via Old French plastre, from the same source, and in early use the English word often had the French spelling. The meaning "gypsum" is from late 14c.; plaster of Paris "powdered calcinated (heat-dried) gypsum," which sets rapidly and expands when mixed with water(mid-15c.) originally was made from the extensive gypsum deposits of Montmartre in Paris. Plaster saint "person who makes a hypocritical show of virtue" is by 1890.

plaster (v.)

early 14c., "to cover or overlay (walls) with plaster;" late 14c., "to coat with a medicative plaster," from plaster (n.) and partly from Old French plastrier "to cover with plaster" (Modern French plâtrer), from plastre. Figurative use, "to load to excess" (with praise, etc.), is from c. 1600. Meaning "to bomb (a target) heavily" is first recorded 1915. Sports sense of "to defeat decisively" is from 1919. as an adjective, plastered is from late 14c. as "coated with plaster." The slang meaning "very drunk" is attested by 1912.

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Definitions of plaster
1
plaster (v.)
apply a heavy coat to;
Synonyms: plaster over / stick on
plaster (v.)
cover conspicuously or thickly, as by pasting something on;
The demonstrators plastered the hallways with posters
Synonyms: beplaster
plaster (v.)
affix conspicuously;
She plastered warnings all over the wall
plaster (v.)
apply a plaster cast to;
plaster the broken arm
plaster (v.)
coat with plaster;
Synonyms: daub
plaster (v.)
dress by covering with a therapeutic substance;
Synonyms: poultice
2
plaster (n.)
a mixture of lime or gypsum with sand and water; hardens into a smooth solid; used to cover walls and ceilings;
plaster (n.)
any of several gypsum cements; a white powder (a form of calcium sulphate) that forms a paste when mixed with water and hardens into a solid; used in making molds and sculptures and casts for broken limbs;
Synonyms: plaster of Paris
plaster (n.)
a medical dressing consisting of a soft heated mass of meal or clay that is spread on a cloth and applied to the skin to treat inflamed areas or improve circulation etc.;
Synonyms: poultice / cataplasm
plaster (n.)
a surface of hardened plaster (as on a wall or ceiling);
there were cracks in the plaster
Synonyms: plasterwork
plaster (n.)
adhesive tape used in dressing wounds;
Synonyms: adhesive plaster / sticking plaster
From wordnet.princeton.edu