Plural of lumen

regular plural

The plural of lumen is lumens or lumina.

Forms of lumen

When harvested, toroids' were stable, but underwent predictable changes over time with their lumens narrowing.2010 February, Christine M. Livoti, and Jeffrey R. Morgan, “Self-Assembly and Tissue Fusion of Toroid-Shaped Minimal Building Units”, in…. From the entry toroid
They first calculated the fractal dimension containing ductal lumens and then they analyzed the fractal details of the ductal network in galactograms to detect early signs of cancerous tissues.2015, Alireza Shirazinodeh et al., “Detection and classification of Breast Cancer in Wavelet Sub-bands of Fractal Segmented Cancerous…. From the entry galactogram
Females of the romaleid grasshopper Romalea guttata generate a defensive secretion in glands surrounding the metathoracic tracheal trunks and the secretion is stored in the tracheal lumina.2009, Jorg D. Hardege, Chemical Ecology, page 142. From the entry romaleid

noun In the International System of Units, the derived unit of luminous flux; the light that is emitted in a solid angle of one steradian from a source of one candela. Symbol: lm.
noun The cavity or channel within a tube or tubular organ.
noun The cavity bounded by a plant cell wall.

What is the plural of lumen?: The plural of lumen is lumens or lumina.
Which is correct, lumens or lumina?: Both are used. lumens is the more common of the two in English writing.
Is lumen countable?: Lumen is a countable noun.

Adapted from Wiktionary: lumen (page history and authors) and the entries of its forms. Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws left out forms marked obsolete, archaic, rare or dialectal and added the examples. Wiktionary data of 2026-09-02.

Last updated: 2026-09-02

Cite this page: “Plural of lumen.” Word.ws, https://word.ws/plural/lumen. Based on Wiktionary, CC BY-SA 4.0.