mesomorphy

The three constitutional variations are endomorphy, mesomorphy, and ectomorphy.

He concluded that delinquents tended to mesomorphy.

And how can a man at the extreme limits of ectomorphy and cerebrotonia ever put himself in the place of one at the limits of endomorphy and viscerotonia, or, except within certain circumscribed areas, share the feelings of one who stands at the limits of mesomorphy and somatotonia?