mitosis

noun

mi·​to·​sis mī-ˈtō-səs How to pronounce mitosis (audio)
plural mitoses mī-ˈtō-ˌsēz How to pronounce mitosis (audio)
1
: a process that takes place in the nucleus of a dividing cell, involves typically a series of steps consisting of prophase, metaphase, anaphase, and telophase, and results in the formation of two new nuclei each having the same number of chromosomes as the parent nucleus compare meiosis
2
: cell division in which mitosis occurs

Examples of mitosis in a Sentence

Recent Examples on the Web
Examples are automatically compiled from online sources to show current usage. Read More Opinions expressed in the examples do not represent those of Merriam-Webster or its editors. Send us feedback.
In the final act of cellular mitosis, the yolk splits, foreshadowing themes of corporeal replication, fragmentation, and destruction. Viv Chen, Vogue, 27 Sep. 2024 When a cell, comprising 46 chromosomes, splits into two cells, this is called mitosis. Krissi Danielsson, Parents, 30 July 2024 Typical cell division happens by either mitosis or meiosis. Krissi Danielsson, Parents, 30 July 2024 Human bodies are made up of cells that have formed from mitosis. Krissi Danielsson, Parents, 30 July 2024 See all Example Sentences for mitosis 

Word History

Etymology

borrowed from German Mitosis (later Mitose), from Greek mítos "length of thread, cord used to separate warp threads" (of uncertain origin) + -ōsis -osis

Note: Term coined by the German biologist Walther Flemming (1843-1905) in Zellsubstanz, Kern und Zelltheilung (Leipzig, 1882), p. 376. Flemming introduces the word first in the compound Karyomitosis as a replacement for Karyokinesis to denote specifically "the metamorphosis of threads in the nucleus" ("Fadenmetamorphose im Kern"). In following sentences he uses the truncated form in the plural Mitosen for mitotic figures ("Kerntheilungsfiguren," i.e, the spindle-shaped figures presented by the chromosomes during mitosis) and in the singular Mitosis for the process of division.

First Known Use

1887, in the meaning defined at sense 1

Time Traveler
The first known use of mitosis was in 1887

Dictionary Entries Near mitosis

Cite this Entry

“Mitosis.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/mitosis. Accessed 22 Nov. 2024.

Kids Definition

mitosis

noun
mi·​to·​sis mī-ˈtō-səs How to pronounce mitosis (audio)
plural mitoses -ˈtō-ˌsēz How to pronounce mitosis (audio)
1
: a process that takes place in the nucleus of a dividing cell and that results in the formation of two new nuclei with the same number of chromosomes as the parent nucleus compare meiosis
2
: a cell division in which mitosis occurs
mitotic adjective

Medical Definition

mitosis

noun
mi·​to·​sis mī-ˈtō-səs How to pronounce mitosis (audio)
plural mitoses -ˌsēz How to pronounce mitosis (audio)
1
: a process that takes place in the nucleus of a dividing cell, involves typically a series of steps consisting of prophase, metaphase, anaphase, and telophase, and results in the formation of two new nuclei each having the same number of chromosomes as the parent nucleus compare meiosis
2
: cell division in which mitosis occurs
mitotic adjective
mitotically adverb

More from Merriam-Webster on mitosis

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