[hahy-druh-fawr-ming] 
| the production of high-octane aromatic compounds for motor fuels by catalytic reforming of naphthas in the presence of hydrogen. |
| hy·dro·form·ing (hī'drə-fôr'mĭng) n. A process in which naphthas are converted to high-octane aromatics in the presence of hydrogen and a catalyst under pressure and heat. hy'dro·form'er n. |
drəˌfɔr