Meanings
Origin
monoid + -oid. A monoid can be viewed as a one-object category, so that a category can be viewed as the horizontal categorification of a monoid, but this almost-circular definition is mostly used as a joke, often associated with a view of category theory as overly abstract nonsense.
Full word history & related roots →Cite this entry
APA
monoidoid. (n.d.). In WatkinsX Dictionary. Retrieved November 3, 2026, from https://dictionary.watkinsx.com/word/monoidoid
MLA
“monoidoid.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/monoidoid. Accessed November 3, 2026.
Chicago
WatkinsX Dictionary, s.v. “monoidoid,” accessed November 3, 2026, https://dictionary.watkinsx.com/word/monoidoid.
Source: monoidoid on Wiktionary, CC BY-SA 4.0.