Definition of osmoticum in US English:

osmoticum

noun

Physiology
  • A substance which plays a significant role in increasing or maintaining osmotic pressure, especially within cells.

Origin

1960s; earliest use found in American Journal of Botany. From osmotic + -um, after Latin nouns in -um.

Pronunciation

osmoticum

/ɒzˈmɒtɪkəm/