12-Letter Words Containing: IOP

• an immunosuppressive drug (trade name Imuran) used to prevent rejection of a transplanted organ

• a physicist who applies the methods of physics to biology

• of or relating to bibliophiles

• of or relating to or characteristic of the subclass Branchiopoda

• aquatic crustaceans typically having a carapace and many pairs of leaflike appendages used for swimming as well as respiration and feeding

• someone who loves (and usually collects) books

• a specialized fungal hypha that produces conidia

• Of or pertaining to optical systems that employ both refractive (dioptric) and reflective (catoptric) elements.

• a dealer in secondhand books (especially rare or curious books)