determine or identify the nature of a problem or an illness

any of several metabolic disorders characterized by abnormally high glucose levels in the blood and marked by excessive urination and persistent thirst

tuberculosis - a serious and highly contagious lung infection transmitted by inhalation or ingestion of tubercle bacilli and manifested in fever and small sores in the lungs

an organism in the early stages of growth prior to birth, hatching, or sprouting; in humans the first eight weeks of development (prior to the fetal stage)

the study of disease by studying cells and tissues under a microscope; or a disease

loss of the ability to move the body or a part of it

or:

inability to act or make a decision

to show (point out, demonstrate, express, or suggest)

a substance (such as weakened or dead a disease-causing microorganism) injected into a person or animal to stimulate the production of antibodies to protect against a disease

a group of animals or plants that are similar — typically identified as a group because they can procreate together (reproduce new members of the group)

of a species that lives on (or in) another species and eats from it without providing return benefit

or:

a person who lives off others' efforts without providing return benefit to them

necessary or important or relating to the basic nature of something

microorganisms (living creatures so small it takes a microscope to see them) that can both cause disease and be beneficial. They are different and larger than viruses.

the medical study of the structure of the body — as in "to study anatomy"

or more rarely:  the structure of a body — as in "a part of the anatomy"

or still more rarely:  any detailed analysis — as in "anatomy of the disaster"

a tropical disease spread by mosquitoes that, while nonexistent in wealthy nations, strikes hundreds of millions of people a year in developing nations — killing over a million each year

more technically:  an infective disease caused by sporozoan parasites that are transmitted through the bite of an infected Anopheles mosquito; marked by paroxysms of chills and fever

not in danger of being affected by something — especially a disease

or:

relating to disease resistance

a bacterial infection typically contracted through a puncture wound with a dirty object; prevented by the DTaP (diphtheria, tetanus, pertussis) vaccine and by subsequent booster shots every 10 years

of or relating to the heart

a pattern of symptoms associated with an illness; or any recognizable pattern — especially when undesirable

the center (or most important part) of something

"fight or flight" stimulating hormone secreted by the adrenal gland in response to stress (making the body feel excited and ready for action)

respiratory disease characterized by inflammation and accumulation of fluid in the lungs; caused by infectious agents (e.g., viruses or bacteria) or by inhalation of certain irritants

bloodsucking parasite that has hooked mouth parts to fasten to the intestinal wall of humans or other mammals; generally entering the body through the foot or other skin

suffering from too few red blood cells

or metaphorically:  lacking vitality

a sheet or band of tough fibrous tissue that connects bones or cartilages

being equal or essentially equal

a science that deals with the history of the earth as recorded in rocks

or more rarely:

the rocks, minerals, and rock formations of an area