filament

noun

fil·​a·​ment ˈfi-lə-mənt 

: a single thread or a thin flexible threadlike object, process, or appendage (see appendage sense 2): such as

a

: a tenuous (see tenuous sense 2) conductor (as of carbon or metal) made incandescent by the passage of an electric current

specifically : a cathode (see cathode sense 2) in the form of a metal wire in an electron tube

b(1)

: a thin and fine elongated constituent part of a gill (see gill entry 2 sense 1)

(2)

: an elongated thin series of cells attached one to another or a very long thin cylindrical single cell (as of some algae, fungi, or bacteria)

c

: the anther-bearing stalk of a stamen see flower illustration

filamentary

ˌfi-lə-ˈmen-t(ə-)rē 

adjective

filamentous

ˌfi-lə-ˈmen-təs 

adjective

Synonyms

• bristle
• fiber
• hair
• thread

Examples of filament in a Sentence

algae covered with tiny filaments

the cable was made up of fine filaments twisted together

Recent Examples on the Web

The filament eruption was modeled and is projected to hit Earth mid to late day on 28 Nov, the SWPC said in a forecast discussion. —Jess Thomson, Newsweek, 27 Nov. 2024

Minor, moderate or greater geomagnetic storms are likely on Thursday and Friday, increasing the Kp index forecast to five and nearly six for either day, respectively, after a filament eruption on the sun’s surface earlier this week, according to NOAA’s three-day forecast. —Ty Roush, Forbes, 27 Nov. 2024

An alternative approach is to sample lactate in interstitial fluid, which mirrors blood levels more reliably, using a slender filament that pokes through the skin. —Alex Hutchinson, Outside Online, 25 Nov. 2024

The bright filaments resemble the wispy structure of a dandelion, and studying their peculiar structure could help astronomers understand how the filaments formed in the first place. —Ashley Strickland, CNN, 2 Nov. 2024

Word History

Etymology

Middle French, from Medieval Latin filamentum, from Late Latin filare to spin — more at file

First Known Use

1594, in the meaning defined above

Kids Definition

filament

noun

fil·​a·​ment ˈfil-ə-mənt 

: a single thread or a thin flexible threadlike object, process, or part: as

a

: a wire (as in a light bulb) that is made to glow by the passage of an electric current

b

: a long chain of cells (as of some bacteria or algae)

c

: the anther-bearing stalk of a plant stamen

filamentous

ˌfil-ə-ˈment-əs 

adjective

Medical Definition

filament

noun

fil·​a·​ment ˈfil-ə-mənt 

: a single thread or a thin flexible threadlike object, process, or appendage

especially : an elongated thin series of cells attached one to another or a very long thin cylindrical single cell (as of some algae, fungi, or bacteria)

filamentous

ˌfil-ə-ˈment-əs 

adjective