Mus·sel·shell 
(mŭsəl-shĕl′)
(mŭsəl-shĕl′) A river of central Montana flowing about 560 km (350 mi) east then north to the Missouri River.
- interferon gamma
- interfertile
- interfertility
- interfluve
- interfluvial
- intergalactic
- intergalactically
- intergenerational
- intergeneric
- intergenic
- interglacial
- intergovernmental
- intergovernmentally
- intergradation
- intergrade
- intergroup
- intergrowth
- interim
- interionic
- interior
- interior angle
- interior decoration
- interior decorator
- interior design
- interior designer