/ Dictionary / Index P plasmid: Meaning and Definition of Find definitions for: plas•mid Pronunciation: (plaz'mid), [key] — n. Microbiol. a segment of DNA independent of the chromosomes and capable of replication, occurring in bacteria and yeast: used in recombinant DNA procedures to transfer genetic material from one cell to another. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: plasmid (Thesaurus) plasma thromboplastic component plasmin Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language