thumb blue

noun

An indigo dye, in the form of small balls or lumps, used in the 19th century for dyeing linen etc.

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Meanings

nounthumb blue (uncountable)
  1. historicalobsoleteuncountableAn indigo dye, in the form of small balls or lumps, used in the 19th century for dyeing linen etc.
Cite this entry
APA

thumb blue. (n.d.). In WatkinsX Dictionary. Retrieved November 4, 2026, from https://dictionary.watkinsx.com/word/thumb%20blue

MLA

“thumb blue.” WatkinsX Dictionary, https://dictionary.watkinsx.com/word/thumb%20blue. Accessed November 4, 2026.

Chicago

WatkinsX Dictionary, s.v. “thumb blue,” accessed November 4, 2026, https://dictionary.watkinsx.com/word/thumb%20blue.

Source: thumb blue on Wiktionary, CC BY-SA 4.0.