Inert ingredient
Inert ingredient means any substance (or group of structurally similar substances if designated by the Agency), other than an active ingredient, which is intentionally included in a pesticide product, except as provided by 174.3 of this chapter.
Source
40 CFR § 152.3
Scoping language
Terms used in this part have the same meaning as in the Act. In addition, the following terms have the meanings set forth in this section.