type O

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Definition

Noun: 1. A blood group in the ABO blood type system: This refers to a classification of human blood based on the presence or absence of specific antigens on the surface of red blood cells. Type O blood lacks both the A and B antigens. 2. An individual with this blood group: A person whose blood is classified as type O.

Usage
  • Type O is a compound noun used as a specific medical and biological term. It is always capitalized ("O") and typically preceded by the word "type."
  • It is used to describe a person's blood type for medical purposes such as transfusions, donations, and understanding genetic inheritance.
Examples
  • As a blood group classification:
    • The most common blood type in the world is type O.
    • Patients with type O blood can only receive transfusions from other type O donors.
  • Referring to an individual:
    • She is a type O donor, which makes her blood highly needed.
    • Because I am type O, I need to know the blood types of my biological parents for a complete medical history.
Advanced Usage
  • Scientific Context: In genetics, the allele for type O is often represented as 'i' and is recessive to the alleles for A and B.
  • Subtypes: Type O can be further specified as O-positive (O+) or O-negative (O-), indicating the presence or absence of the Rh factor (Rhesus factor) antigen.
Variants and Related Words
  • Type O blood: The full, explicit phrase.
  • Blood group O / Blood type O: Alternative phrasings with the same meaning.
  • Universal donor: This is a related concept, specifically referring to individuals with type O-negative blood, whose red blood cells can be transfused to patients of any ABO and Rh blood type in an emergency.
Synonyms
  • Blood group O
  • Blood type O
Different Meanings
  • Type O has a highly specific meaning in medicine and biology. It is not to be confused with:
    • The letter 'O': Used as a letter of the alphabet or a shape.
    • The number zero (0): Used as a numeral.
    • Type A, Type B, Type AB: Other classifications within the same ABO blood group system.
Noun
  1. the blood group whose red cells carry neither the A nor B antigens
    • people with type O blood are universal donors

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