This document defines and distinguishes several medical terms related to vomiting and defecating blood. It defines melenemesis as vomiting black material, hematochezia as passing fresh blood through the anus, and hematemesis as vomiting blood. It notes that coffee ground emesis refers to melenemesis and that the logical terms are melenemesis versus hematemesis and melanochezia versus hematochezia.

1. MELENEMESIS AND MELENOCHEZIA
ANWER GHANI
FIBMS
IRAQ

2. Melenemesis
melenemesis
mel·e·nem·e·sis (mel'ĕ-nem'ĕ-sis),
Vomiting of dark-colored or blackish material.
See also: black vomit.
[G. melas, black, + emesis, vomiting]

3. Haematochezia
Haematochezia is the passage of fresh blood through the anus,
usually in or with stools (contrast with melena).The term is from
Greek αἷμα ("blood") and χέζειν ("to defaecate"). Hematochezia is
commonly associated with lower gastrointestinal bleeding,

4. Melanin
Melanin (/ˈmɛlənɪn/ (About this soundlisten); from Greek: μέλας
melas, "black, dark") is a broad term for a group of natural
pigments found in most organisms.

5. Hematemesis
Hematemesis is the vomiting of blood.

6. Coffee ground emesis = MELENEMESIS
Coffee ground emesis refers to a particular appearance of vomit.
Within organic heme molecules of red blood cells is the element
iron, which oxidizes.

7. Colors

8. EMESIS
Definition of emesis
: an act or instance of vomiting

9. Summery
Emesis = vomiting
Chezia = defecation
Hemat = blood
Melena = black

10. Logical Terminology
Hematemesis vs Melenemesis
Hematochezia vs Melenochezia

11. What to use
MELENEMESIS ( NOT COFFEE GROUND EMESIS)
MELENOCHEZIA ( NOT MELENA)

12. Thanks
The discussion here was about medical terms.