"Copperas" Natural Recordings by Native Speakers
Copperas is an archaic term for ferrous sulfate, a type of salt used as a mordant in dyeing, astringent in medicine, and in tanning leather. It is often used in historical or literary contexts to add a sense of antiquity to descriptions of art, medicine, or other activities.
Copolymerize is a verb that means to combine two or more different monomers (small molecules) to form a single polymer (a large molecule) in which the different monomers are linked together. This process is called copolymerization. Copolymerization can be used to create a wide range of materials with unique properties, such as plastics, elastomers, and adhesives.
Coppélia is a classic comic ballet, a lighthearted and entertaining work with a storyline that centers around a fantastical puppets lady, Coppélia, who comes to life. The ballet premiered in 1870 and is still widely performed today, with music by Léo Delibes and a libretto by Charles Nuitter and arr. Arthur Saint-Léon.