pertaining to or of the nature of a filament.

1835–45; filament + -ary

interfilamentary, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
filament (ˈfɪləmənt)
1.  the thin wire, usually tungsten, inside a light bulb that emits light when heated to incandescence by an electric current
2.  electronics a high-resistance wire or ribbon, forming the cathode in some valves
3.  a single strand of a natural or synthetic fibre; fibril
4.  botany
 a.  the stalk of a stamen
 b.  any of the long slender chains of cells into which some algae and fungi are divided
5.  ornithol the barb of a down feather
6.  anatomy any slender structure or part, such as the tail of a spermatozoon; filum
7.  astronomy
 a.  a long structure of relatively cool material in the solar corona
 b.  a long large-scale cluster of galaxies
[C16: from New Latin fīlāmentum, from Medieval Latin fīlāre to spin, from Latin fīlum thread]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Astronomers have now learned that when a comet ejects debris, it takes on a fine, filamentary structure.
Plasma was named after its organic-style movement, its filamentary nature and habit of twisting into pairs.
The structure above is a cut of the plasma universe showing the filamentary currents produced by plasma in flux.
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