2. Prefix. 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) ¹
3. Prefix. Used to form words relating to organic matter (in the soil etc) ¹
¹ Source: wiktionary.com
Medical Definition of Organo-
1. Organ; organic. Origin: G. Organon (05 Mar 2000)