Definition

Verb: 1. To make or become black: The process of causing something to turn black in color. 2. To convert into, or infiltrate with melanin: The biological process of depositing or producing the dark pigment melanin within tissues.

Usage and Examples

• To make or become black:
  • The intense heat from the fire began to melanise the wooden beams.
  • Over time, the silver jewelry melanised due to exposure to sulfur compounds.
• To convert into/infiltrate with melanin (primarily biological):
  • Skin cells melanise in response to ultraviolet radiation as a protective mechanism.
  • The genetic mutation affects the ability of the cells to melanise properly.

Advanced Usage

• The verb is often used in technical, scientific, or formal contexts, particularly in biology, chemistry, and medicine. Its more common synonyms in everyday language are "blacken" or "darken."
• It can be used both transitively (with a direct object) and intransitively (without a direct object).
  • Transitive: "The disease melanised the tissue." (The disease made the tissue black.)
  • Intransitive: "The tissue melanised." (The tissue became black.)

Variants and Related Words

• Melanize: An alternative spelling with the same meaning.
• Melanin (n): The dark brown to black pigment responsible for the color of skin, hair, and eyes.
• Melanosis (n): A medical condition characterized by abnormal deposits of melanin.
• Melanocyte (n): A cell in the skin that produces melanin.

Synonyms

• Blacken
• Darken
• Pigment (in a biological context)

Antonyms

• Bleach
• Whiten
• Lighten

Notes on Different Meanings

The two core definitions are closely related but applied in different contexts: 1. The first meaning (to make/become black) is general and can apply to any object or substance changing color. 2. The second meaning (to convert/infiltrate with melanin) is specific to biological processes involving the pigment melanin, such as tanning, animal coloration, or certain pathological conditions.

Verb

1. make or become black
   • The smoke blackened the ceiling
   • The ceiling blackened
2. convert into, or infiltrate with melanin