femtoradian

F4E1M3T1O1R1A1D2I1A1N1

noun

One quadrillionth (10⁻¹⁵) of a radian.

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Meanings

nounfemtoradian (plural femtoradians)

plural femtoradians

  1. One quadrillionth (10⁻¹⁵) of a radian.

    Of particular interest, we measured the angular deflection of a mirror down to 560 femtoradians and showed the signal to noise ratio to be amplified by a factor of 150.

    2024, P. Benjamin Dixon, David J. Starling, Nathan S. Williams, Praveen Vudyasetu, Andrew N. Jordan, John C. Howell, “Deflection Measurements with Weak Values”, in Frontiers in Optics 2010/Laser Science XXVI, →DOI

Origin

From femto- + radian.

Full word history & related roots →

Rhymes & wordplay

Anagrams

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Cite this entry
APA

femtoradian. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/femtoradian

MLA

“femtoradian.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/femtoradian. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “femtoradian,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/femtoradian.

Source: femtoradian on Wiktionary, CC BY-SA 4.0.