What is "organo-"

Organo- \Or"ga*no-\ [See Organ.] A combining form denoting relation to, or connection with, an organ or organs.

pre. 1 Used to form words relating to organs of the body 2 Used in chemistry to form adjectives and nouns describing compounds in which an organic group is attached to an inorganic element or grouping (sometimes hyphenated) 3 Used to form words relating to organic matter (in the soil etc)