actin

1 of 2

noun

ac·tin ˈak-tən How to pronounce actin (audio)

: a cellular protein found especially in microfilaments (such as those comprising myofibrils) and active in muscular contraction, cellular movement, and maintenance of cell shape

actin-

2 of 2

combining form

variants or actini- or actino-

: having a radiate form

actinolite

: actinic radiation (such as X-rays)

actinometer

Example Sentences

Recent Examples on the Web

Noun

Other microorganisms travel using amoeboid movement, driven by flexing of their cellular skeletons, built from the protein actin.

Tom Siegfried, Smithsonian, 26 Sep. 2019 Filaments of the protein actin, for example, could have stabilized contacts between the hosts and symbionts and improved the coupling of their metabolisms.

Quanta Magazine, 9 Apr. 2019 Wan believes the cell’s preference depends on the interplay between two elements of the cellular skeleton: actin and myosin.

Tim Vernimmen, Quanta Magazine, 31 Jan. 2017 Nearly all multicellular animals, except for simple ones like sponges, depend on muscles to move, and all their muscles use some form of contracting fibers in which filaments of the proteins actin and myosin pull past one another to generate force.

Quanta Magazine, 13 June 2018 Like a pasta maker, the scale cell squeezes out and assembles a lattice of actins.

Gwen Pearson, WIRED, 22 Dec. 2014

Word History

Etymology

Noun

probably from act entry 2 or act(ivate) + -in entry 1

Combining form

borrowed from Greek aktino-, from aktīn-, aktís "ray, beam, spoke of a wheel"

Note: The Greek word has traditionally been linked with Sanskrit aktú-, conjectured to mean "twilight," and with Germanic *uŋhtwōn- "last part of the night, dawn," whence Old English ūhte "twilight, daybreak," Old High German uohta "dawn," Old Norse ōtta "last part of the night," Gothic uhtwo "dawn," from Indo-European *n̥k^wt-u-n-, a zero-grade derivative of *nok^wt-/*nek^wt- "night" (see night entry 1). Robert Beekes (Etymological Dictionary of Greek, Leiden, 2009) rejects this connection on the grounds that aktís "shows no trace of a labiovelar." In reference to actinic radiation, the formative actino- was probably first used by John herschel in actinometer (1833).

First Known Use

Noun

1942, in the meaning defined above

单词	actin
释义	actin 1 of 2 noun ac·tin ˈak-tən : a cellular protein found especially in microfilaments (such as those comprising myofibrils) and active in muscular contraction, cellular movement, and maintenance of cell shape actin- 2 of 2 combining form variants or actini- or actino- 1 : having a radiate form actinolite 2 : actinic radiation (such as X-rays) actinometer Example Sentences Recent Examples on the Web Noun Other microorganisms travel using amoeboid movement, driven by flexing of their cellular skeletons, built from the protein actin. Tom Siegfried, Smithsonian, 26 Sep. 2019 Filaments of the protein actin, for example, could have stabilized contacts between the hosts and symbionts and improved the coupling of their metabolisms. Quanta Magazine, 9 Apr. 2019 Wan believes the cell’s preference depends on the interplay between two elements of the cellular skeleton: actin and myosin. Tim Vernimmen, Quanta Magazine, 31 Jan. 2017 Nearly all multicellular animals, except for simple ones like sponges, depend on muscles to move, and all their muscles use some form of contracting fibers in which filaments of the proteins actin and myosin pull past one another to generate force. Quanta Magazine, 13 June 2018 Like a pasta maker, the scale cell squeezes out and assembles a lattice of actins. Gwen Pearson, WIRED, 22 Dec. 2014 Word History Etymology Noun probably from act entry 2 or act(ivate) + -in entry 1 Combining form borrowed from Greek aktino-, from aktīn-, aktís "ray, beam, spoke of a wheel" Note: The Greek word has traditionally been linked with Sanskrit aktú-, conjectured to mean "twilight," and with Germanic uŋhtwōn- "last part of the night, dawn," whence Old English ūhte* "twilight, daybreak," Old High German uohta "dawn," Old Norse ōtta "last part of the night," Gothic uhtwo "dawn," from Indo-European n̥k^wt-u-n-, a zero-grade derivative of nok^wt-/nek^wt- "night" (see night entry 1). Robert Beekes (Etymological Dictionary of Greek,* Leiden, 2009) rejects this connection on the grounds that aktís "shows no trace of a labiovelar." In reference to actinic radiation, the formative actino- was probably first used by John herschel in actinometer (1833). First Known Use Noun 1942, in the meaning defined above Medical Definition actin noun ac·tin ˈak-tən : a protein found especially in microfilaments (as those comprising myofibrils) and active in muscular contraction, cellular movement, and maintenance of cell shape see f-actin, g-actin
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actin

noun

combining form

Example Sentences

Word History

Medical Definition

noun