aquo-
combining form 
Etymology: International Scientific Vocabulary, from Latin aqua water + International Scientific Vocabulary -o- 
1. : containing a molecule of water as part of a coordination complex 
< hexaquocobalt (III) chloride [Co (H2O)6]Cl3 >
2. : derived from water  — in names of chemical compounds
< aquocarbonic acid OC(OH)2 >
— compare ammono- 2
1.
< hexaquocobalt (III) chloride [Co (H2O)6]Cl3 >
2.
< aquocarbonic acid OC(OH)2 >
— compare ammono- 2