Definition of "ectomorphy" []

• Slender, weak, and lightweight (noun)

WordNet. Princeton University. 2010.

• "These basic elements he named endomorphy, mesomorphy and ectomorphy, for they seemed to derive from the three layers of the human embryo, the endoderm, the mesoderm and the ectoderm."
• "No one is simply an endomorph without having at the same time some mesomorphy and ectomorphy, but we have these components in varying degrees."
• "According to Sheldon's system a 7-1-1 (seven-one-one) is the most extreme endomorph with minimal mesomorphy and ectomorphy."