haematin

A scientist examines a haematin sample under a microscope.

Definition

1. Noun (Biochemistry):
   • A dark blue or brown pigment: "haematin" is an iron-containing compound derived from haemoglobin, formed when haemoglobin is broken down. It is a key component in the process of haemoglobin degradation and is often seen in the context of blood chemistry.

Usage Examples

• Noun:
  • The presence of haematin in the urine can indicate a breakdown of red blood cells. (Haematin is a pigment formed from haemoglobin.)
  • Haematin is used in laboratory tests to study the metabolism of haemoglobin. (Haematin is a chemical compound important for research.)

Advanced Usage

• "haematin crystals": Microscopic crystals formed from haematin, sometimes used in forensic science to identify bloodstains.

  • Forensic scientists examined haematin crystals to confirm the presence of blood at the crime scene. (Haematin crystals are a specific form of the pigment.)

• "haematin assay": A laboratory procedure to measure the concentration of haematin in biological samples.

  • The haematin assay helped assess the extent of haemolysis in the patient's blood. (Haematin assay is a quantitative test.)

Variants and Related Words

• Haematinic (adj): relating to or promoting the formation of haemoglobin.

  • The doctor prescribed a haematinic supplement to treat the patient's anaemia. (Haematinic substances help increase haemoglobin levels.)

• Haemato-: a prefix meaning "blood," used in compound words like haematology (the study of blood).

  • Haematology is the branch of medicine that studies blood and its disorders. (Haemato- is a combining form.)

Synonyms

• Haemochromogen: a related iron-containing pigment derived from haemoglobin.
• Bilirubin: a yellow pigment produced from haem breakdown, though chemically distinct from haematin.

Related Idioms

• "to turn to haematin": a phrase used metaphorically to describe something becoming dark or degraded, though not common in everyday speech.
  • The old blood stain turned to haematin over time, becoming a dark brown spot. (This idiom is rare and technical.)

Phrasal Verbs

• None: "haematin" is a noun and does not form phrasal verbs. Its usage is primarily in scientific contexts as a standalone term.