bacilli

A scientist observes bacilli under a microscope.

Definition

Noun (plural form; singular: bacillus) - Bacteriology: Bacilli are rod-shaped bacteria, typically gram-positive or gram-negative, that are found in various environments. They can be beneficial (e.g., in soil) or pathogenic (e.g., causing diseases like anthrax or tuberculosis). - General usage: Refers to any microorganisms that are rod-shaped, often used informally to mean "bacteria" in a broad sense.

Usage Examples

• (Rod-shaped bacteria were found in the sample.)
• (Certain rod-shaped bacteria are beneficial for food fermentation.)
• (A specific rod-shaped bacterium causes anthrax.)

Advanced Usage

• "Gram-positive bacilli": A classification based on cell wall structure; examples include and .
  • The culture showed gram-positive bacilli, indicating a possible infection. (The bacteria stained purple in the Gram test.)
• "Bacilli in soil": Refers to bacteria like that help decompose organic matter.
  • Bacilli in soil contribute to nutrient cycling. (They break down dead plants and animals.)

Variants and Related Words

• Bacillus (n, singular): a single rod-shaped bacterium.
  • A single bacillus can multiply rapidly under ideal conditions. (One rod-shaped bacterium reproduces quickly.)
• Bacillary (adj): relating to or caused by bacilli.
  • The patient had a bacillary infection that required antibiotics. (An infection caused by rod-shaped bacteria.)
• Bacilliform (adj): shaped like a rod or bacillus.
  • The cells were bacilliform under the microscope. (The cells had a rod-like shape.)

Synonyms

• Rod-shaped bacteria: bacteria that are cylindrical in shape.
• Bacteria: a general term for microorganisms (though not all bacteria are rod-shaped).
• Microbes: a broader term for microscopic organisms, including bacilli.

Related Idioms

• There are no common idioms directly involving "bacilli," as it is a technical term. However, in scientific contexts, it may appear in phrases like:
  • "Bacilli in culture": referring to growing rod-shaped bacteria in a laboratory setting.

    • The researcher observed bacilli in culture after 24 hours. (Rod-shaped bacteria grew in the petri dish.)

Phrasal Verbs

• No phrasal verbs are associated with "bacilli," as it is a noun referring to a specific type of microorganism.