What does the suffix Chondria mean

Myelin sheath of nerve fibers;It is a group of letters you can add to the end of a root word*.Sometimes a number between hyphens is inserted before it to state which atom the =o.Chondrosarcoma tends to grow slowly, so it might not cause signs and symptoms at first.Mitochondria is the plural form of the mitochondrion.Person having power, and is attached to roots to form nouns that mean ruler;

The meaning of hypochondria is excessive concern about one's health especially when accompanied by imagined physical ailments;