osmoticum

== English == === Etymology === From 1961 osmotic +‎ Latin -um (“Latin neuter noun ending”) on model of Latin -um nouns. First attested in American Journal of Botany. === Noun === osmoticum (plural osmotica) (biology) Any substance that acts to supplement osmotic pressure in a cell ==== References ==== “osmoticum”, in OED Online ⁠, Oxford: Oxford University Press, launched 2000.