Definition of BLOOD


Blood is a noun representing a vital bodily fluid that circulates throughout the cardiovascular system, transporting oxygen, nutrients, hormones, and waste products to and from cells and tissues. It involves several key aspects:

Composition: Blood is composed of various components, including plasma, red blood cells (erythrocytes), white blood cells (leukocytes), and platelets (thrombocytes). Plasma is the liquid portion of blood, while the cellular elements carry out specific functions within the body.

Transportation: Blood serves as the primary mode of transportation within the body, carrying oxygen from the lungs to cells and tissues and transporting carbon dioxide and other waste products from cells back to the lungs for exhalation or to the kidneys for filtration and excretion.

Regulation: Blood plays a vital role in maintaining homeostasis by regulating body temperature, pH balance, and fluid volume. It also transports hormones and other signaling molecules that regulate physiological processes such as metabolism, growth, and immune responses.

Clotting and Immunity: Blood contains platelets and various proteins involved in blood clotting (coagulation), which helps prevent excessive bleeding from injuries. Additionally, white blood cells play a crucial role in the body’s immune response, defending against pathogens such as bacteria, viruses, and foreign substances.

In summary, blood is a complex fluid essential for sustaining life, providing oxygen and nutrients to cells, removing waste products, regulating body functions, and supporting immune responses and wound healing. Its diverse functions are integral to overall health and well-being.

Examples of BLOOD in a sentence

  • The nurse carefully drew a sample of blood from the patient’s vein for testing.
  • The blood donation center collected units of blood to replenish their supply for medical procedures.
  • Hemoglobin is a protein found in red blood cells that carries oxygen throughout the body.
  • Blood pressure is measured in millimeters of mercury (mmHg) and indicates the force exerted by circulating blood on the walls of blood vessels.
  • The doctor ordered a blood test to check for any abnormalities in the patient’s blood chemistry.
  • White blood cells play a crucial role in the body’s immune system, defending against infections and foreign invaders.
  • The vampire legend often revolves around creatures that feed on human blood to sustain their existence.
  • Blood clotting is a natural process that prevents excessive bleeding when blood vessels are damaged.

Etymology of BLOOD

The term blood has ancient etymological roots, originating from the Old English word “blōd,” which was derived from the Proto-Germanic word “blōþam.”

  • Proto-Germanic Origins: The term blood finds its earliest origins in the Proto-Germanic language, where “blōþam” denoted the vital fluid circulating in living organisms.
  • Old English Development: In Old English, “blōd” continued to refer to the vital fluid essential for life, serving as a fundamental concept in both physiological and symbolic contexts.
  • Symbolism and Meaning: Beyond its physiological significance, blood acquired symbolic and cultural meanings, often representing life, vitality, kinship, and lineage. It held spiritual significance in various religious and cultural traditions.
  • Evolution in Usage: Throughout history, the term blood has retained its core meaning while evolving to encompass a wide range of metaphorical and symbolic associations, including family ties, ancestry, loyalty, and sacrifice.

From its Proto-Germanic origins to its multifaceted usage in modern language and culture, blood remains a deeply ingrained concept, symbolizing the essence of life, connection, and identity.


  • Lifeblood
  • Vital fluid
  • Hemoglobin
  • Circulation
  • Sanguine fluid
  • Plasma
  • Hematology
  • Claret


  • Water
  • Serum
  • Plasma
  • Lymph
  • Tissue fluid
  • Non-bloody fluid
  • Clear fluid
  • Aqueous fluid


  • Hemoglobin
  • Red blood cells
  • White blood cells
  • Platelets
  • Hematology
  • Blood vessels
  • Bloodstream
  • Coagulation

🌐 🇬🇧 BLOOD in other languages

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