melena

As nouns the difference between melena and dysentery

is that melena is a passage of dark, tarry stools containing blood, as the result of upper gastrointestinal bleeding while dysentery is a disease characterised by inflammation of the intestines, especially the colon (large intestine), accompanied by pus (white blood cells) in the feces, fever, pain in the abdomen, high volume of diarrhea, and possible blood in the feces.

As nouns the difference between melena and hematemesis

is that melena is a passage of dark, tarry stools containing blood, as the result of upper gastrointestinal bleeding while hematemesis is (medicine) blood within vomitus; the vomiting of blood.

As nouns the difference between melena and melene

is that melena is a passage of dark, tarry stools containing blood, as the result of upper gastrointestinal bleeding while melene is an unsaturated hydrocarbon, C₃₀H₆₀, of the ethylene series, obtained from beeswax as a white, scaly, crystalline wax.

As nouns the difference between taxonomy and melena

is that taxonomy is the science or the technique used to make a classification while melena is a passage of dark, tarry stools containing blood, as the result of upper gastrointestinal bleeding.