Is “Endomorph” a Scrabble word?

1.A mineral, especially a crystal, enclosed within another

2.A person of the endomorphic physical type, characterised by big bones, round face, large trunk and thighs and a naturally high degree of body fat, especially around the midsection.

3.A person having a theoretical body type with slow metabolism in which weight is gained easily, but fat levels are hard to reduce. Endomorphic bodybuilders tend to be the most massive.