aquo
1 of 2adjective
aq·uo
ˈa(ˌ)kwō,
ˈä-
: of or relating to compounds derived from water
lithium hydroxide LiOH is an aquo base
compare ammono aquo-
2 of 2combining form
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- sense 2 
Word History
Etymology
Adjective
aquo-
Combining form
International Scientific Vocabulary, from Latin aqua water + International Scientific Vocabulary -o-