| Abbreviation | Definition |
|---|---|
| HBOA | Hydroxy-1,4-BenzOxAzin-3-one |
| HBOB | Hydrogen Bis(Oxalato)Boric (Bis(Oxalato)Boric acid) |
| HBON | Hydrogen BONd energy |
| HBr | HydroBromic acid |
| HC | High Carbon |
| HCA | HeteroCyclic Amine |
| HCA | Hydroxy Carboxylic Acid |
| HCA | Hydroxy Citric Acid |
| HCA | hydroxycitric acid and |
| HCB | Hexachlorobenzene |
| HCC | Heat Of Carbon Combustion |
| HCD | Higher Collisional Dissociation |
| HCF | Hexavalent Chrome Free |
| HCFC | Hydro-Chloro-Fluoro Carbon |
| HCFCs | Hydrochlorofluorocarbons |
| HCIS | Hazardous Chemical Information System |
| HCL | Hardware Compatibility List |
| HCL | Help Charlie Lake |
| HCl | HydroChloric Acid |
| HCL | hydrogen chloride |