40 CFR 156.203 - Definitions.
Terms in this subpart have the same meanings as they do in the Federal Insecticide, Fungicide, and Rodenticide Act, as amended. In addition, the following terms, as used in this subpart, shall have the meanings stated below:
Fumigant means any pesticide product that is a vapor or gas or forms a vapor or gas on application and whose method of pesticidal action is through the gaseous state.
Restricted-entry interval or REI means the time after the end of a pesticide application during which entry to the treated area is restricted.