Word.ws English Dictionary

blue button

blue button noun: a colony of hydrozoan polyps of the species Porpita porpita.

blue button: a colony of hydrozoan polyps of the species Porpita porpita
Image: Adityamadhav83, CC BY-SA 3.0, via Wikimedia Commons

Noun

blue button (plural blue buttons)

  1. A colony of hydrozoan polyps of the species Porpita porpita
  2. (UK, historical) An unauthorized clerk in the stock exchange.
    • Unauthorized clerks or Blue Buttons can make enquiries in the House and ask for prices but may not enter into any contract, while Red Buttons are clerks entitled to work in the Settling or checking Room.1954, Margaret Shelly Rix, Stock Market Economics, page 17
    • Then a blue button dashed to the box to pick up the call.1987, The Director, volume 41, number 3, page 118

Forms of blue button

pluralblue buttons
alternative formblue-button

Questions about blue button

What does blue button mean?
Blue button means a colony of hydrozoan polyps of the species Porpita porpita.
What part of speech is blue button?
Blue button is a noun.
What is the plural of blue button?
The plural of blue button is blue buttons.

Words near blue button in the dictionary

  1. blue bugles
  2. blue bull
  3. blue bulls
  4. blue bunchgrass
  5. blue butter
  6. blue button
  7. blue buttons
  8. blue carbon
  9. blue card
  10. blue cards
  11. blue cat

Source and license

Adapted from Wiktionary: blue button (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

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Cite this entry: “blue button.” Word.ws, https://word.ws/blue_button. Based on Wiktionary, CC BY-SA 4.0.