Plasmid

//ˈplæzmɪd// noun

noun ·Uncommon ·Advanced level

Definitions

Noun
  1. 1
    A loop of double-stranded DNA that is separate from — and replicates independently of — the chromosomes; such loops are most commonly found in bacteria, but they are also sometimes found in archaeans and eukaryotic cells, and they are used in genetic engineering as a vector for gene transfer.

    "These discussions have left a plethora of terms adrift: pangenes, bioblasts, plasmagenes, plastogenes, chondriogenes, cytogenes and proviruses, which have lost their original utility owing to the accretion of vague or contradictory connotations. At the risk of adding to this list, I propose plasmid as a generic term for any extrachromosomal hereditary determinant."

  2. 2
    a small cellular inclusion consisting of a ring of DNA that is not in a chromosome but is capable of autonomous replication wordnet

Example

More examples

"The plasmid and the nucleoid are bacterial components that contain DNA."

Etymology

From plasma + -id, coined by American molecular biologist Joshua Lederberg in 1952.

Related phrases

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.