石せっ膏こう

noun, noun which may take the genitive case particle 'no'

gypsum; plaster; calcium sulfate

Refers to the mineral gypsum (calcium sulfate dihydrate) and its calcined form, plaster of Paris. Common in contexts like sculpture, construction, and medical casts.

• 石せっ膏こうで型かたを取とる。

  Make a mold with plaster.

• 骨こっ折せつした腕うでを石せっ膏こうで固かためる。

  Set a broken arm in a plaster cast.