In a biological cell, a melanosome is an organelle containing melanin, the most common light-absorbing pigment found in the animal kingdom.
Cells that synthesize melanins are called melanocytes, and also the retinal pigment epithelium cells, whereas cells that have merely engulfed the melanosomes are called melanophages.
Read more about Melanosome: Shape, Synthesis of Melanin, Pseudopodia, In Animals, In Fossils, Templating