Answer:

hematin

Answer	Crossword Clue
HEMATIN	Decomposed hemoglobin
HEMATIN	Iron-containing substance.
HEMATIN	Pigment containing iron.

HEMATIN	Blood component
HEMATIN	Blood pigment
HEMATIN	Blood compound

Crossword

a puzzle consisting of a grid of squares and blanks into which words crossing vertically and horizontally are written according to clues.