Definitions

1. adjective

resembling or covered with wax or having the texture of wax; having a waxy or greasy appearance or texture; covered with a white or yellowish, powdery or waxy substance

“The ceraceous coating on the statue helped preserve it for centuries.”

2. noun

a waxy or greasy substance, especially one that resembles wax or has a similar texture; a white or yellowish, powdery or waxy deposit or coating

“The ceraceous substance on the walls was a sign of a long-forgotten fire.”