also shin-plaster, piece of paper soaked in vinegar and used to treat sore legs, from shin (n.) + plaster (n.). In U.S. history, jocularly or as a term of abuse for "devalued low-denomination paper currency" (1824).
Old English scinu "shin, fore part of the lower leg," from Proto-Germanic *skino "thin piece" (source also of Dutch scheen, Old High German scina, German Schienbein "shin, shinbones"), from PIE root *skei- "to cut, split." Shin splints is attested from 1930.
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.
also piastre, 1620s, "Spanish dollar, piece of eight," also used as the name of a monetary unit and coin of Turkey (1610s, in Turkish called ghurush, but originally debased Spanish dollars), from French piastre, from Italian piastra "thin metal plate," short for impiastro "plaster," from Latin emplastrum, from Greek emplastron (see plaster (n.)). The Italian word was applied to the Spanish silver peso, later to the Turkish coin based on it. Compare shinplaster.
Others are reading
Definitions of shinplaster from WordNet
paper money of little value issued on insufficient security;