he·ma·tol·o·gy 
(hē′mə-tŏlə-jē)
(hē′mə-tŏlə-jē)n.
The branch of medicine that deals with the diagnosis and treatment of diseases of the blood and bone marrow.
he′ma·to·logic (-tə-lŏjĭk), he′ma·to·logi·cal adj.
he′ma·to·logi·cal·ly adv.
he′ma·tolo·gist n.
- ontogenetic
- ontogenetically
- ontogenic
- ontogenically
- ontogeny
- ontological
- ontologically
- ontologist
- ontology
- on top
- on top of
- on top of the world
- on trial
- on/under pain of
- on/upon(one's) hands
- on/upon (one's) hands
- on/upon request
- on/upon the heels of
- on uppers
- onus
- on view
- on vinyl
- on waivers
- onward
- on wax