Definition of materia subtilis in English:

materia subtilis

noun

Philosophy
historical
  • = subtle matter.

Origin

Mid 17th century; earliest use found in Robert Hooke (1635–1703), natural philosopher. From post-classical Latin materia subtilis, lit. ‘subtle matter’ (1644 in a translation of Descartes by E. de Courcelles, after French matiere subtile (Descartes Dioptrique i. 87)) from classical Latin matēria + subtīlis.

Pronunciation

materia subtilis

/məˌtɪərɪə ˈsʌbtɪlɪs/