ectomorphy
/ˈɛktəˌmɔrfi/
noun
- A body type characterized by a lean, thin, and often tall physique with low body fat and narrow shoulders and hips.
- People with ectomorphy often have a fast metabolism and find it difficult to build muscle.
- His ectomorphy made it hard for him to gain weight even when he ate a lot.
- The fitness trainer explained that ectomorphy is just one of three main body types.