From mothproof + -er.
mothproofer (plural mothproofers)
- Any substance used to make things mothproof.
1964, Arnold Mallis, Handbook of Pest Control: The Behavior, Life History, and Control of Household Pests, MacNair-Dorland Company:The dye-bath mothproofers are permanent-type mothproofers which are as the name implies applied in the dye bath.