Meaning & Definition of word "Bacterium"

Bacterium

/bækˈtɪəriəm/

noun:

  • 1. A singular form of bacteria; a microscopic single-celled organism that can exist either independently or as a parasite.
    • Example: The bacterium responsible for the infection was identified as Staphylococcus aureus.
  • 2. A unicellular microorganism that can be found in various environments, known to play critical roles in ecosystems and human health.
    • Example: The soil bacterium helped in the decomposition of organic matter.
  • 3. An organism classified as a prokaryote, which lacks a membrane-bound nucleus.
    • Example: Scientists studied the bacterium to understand its resistance to antibiotics.
  • 4. Any of a large group of bacteria, some of which can cause diseases in animals and humans.
    • Example: The child was diagnosed with an illness caused by a pathogenic bacterium.
  • 5. A single bacterium cell, often used in scientific research and microbiology.
    • Example: They observed the behavior of a single bacterium under the microscope.

Etymology

From New Latin, derived from the Greek 'bakterion', diminutive of 'bakteros' meaning 'staff' or 'rod'.

Common Phrases and Expressions

bad bacterium:

A harmful or disease-causing bacterium.

beneficial bacteria:

Bacteria that are advantageous to health or the environment.

bacterium culture:

A method to grow bacteria in a controlled environment for study.

Related Words

bacteriology:

The study of bacteria, especially in relation to medicine and agriculture.

antibacterial:

Substance that kills bacteria or inhibits their growth.

bacteriophage:

A virus that infects and replicates within bacteria.

Slang Meanings of bacterium

Meaning: Bug

Example Sentence: That bug caused all the trouble in the lab!

Meaning: Germ

Example Sentence: Washing your hands can help you avoid those pesky germs!