| melanogen | A colourless substance that may be converted into melanin; e.g., some patients with widespread metastases of melanoma excrete melanogen in their urine, and melanin is formed when the urine is exposed to air (i.e., oxidised) for a few hours. Origin: melanin + G. -gen, producing (05 Mar 2000) |
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| melanogenaemia | The presence of melanin precursors in the blood; may occur in malignant melanoma with metastasis. Origin: melanogen + G. Haima, blood (05 Mar 2000) |
| melanogenesis | Formation of melanin. Origin: melanin + G. Genesis, production (05 Mar 2000) |