Morse code

American  

noun

• Morse codes
  plural

1. either of two systems of clicks and pauses, short and long sounds, or flashes of light, used to represent the letters of the alphabet, numerals, etc.: now used primarily in radiotelegraphy by ham operators.

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Morse code British  

noun

1. Also called: international Morse code. a telegraph code formerly used internationally for transmitting messages; it was superseded by satellite technology (the Global Marine Distress and Safety System) in 1999. Letters, numbers, etc, are represented by groups of shorter dots and longer dashes, or by groups of the corresponding sounds, dits and dahs, the groups being separated by spaces

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Morse code Scientific  

1. A code developed by Samuel Morse used for transmitting messages in which letters of the alphabet and numbers are represented by various sequences of written dots and dashes, or short and long signals such as electric tones or voltages. Morse code was used extensively in telegraphy. In a format that has been standardized for international use, it is still sometimes used for long distance radio communication.

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Other Word Forms

Noun Inflected Forms

• Morse codes
  plural

Etymology

Origin of Morse code

First recorded in 1830–40; after S. F. B. Morse

Example Sentences

See Examples For:

Morse code

While the telegraph had already achieved near-instant communication, it was limited to the sterile clicks of Morse code.

From The Wall Street Journal ● Apr. 24, 2026

You are in the passenger seat with no seat belt, and the dashboard lights are blinking like they’re trying to tell you something in Morse code, which you never learned.

From MarketWatch ● Dec. 2, 2025

A thousand small cylindrical acrylic mirrors planted in the sand compose a Morse code poem imagining a dialogue between Tangun, the legendary founder of the first Korean kingdom, and an Egyptian pharaoh.

From Barron's ● Nov. 11, 2025

When worn by a person, the glasses noticed the approach of eyelashes and identified when the wearer blinked Morse code for "E C U S T," the abbreviation for the researchers' institution.

From Science Daily ● May 22, 2024

Fear had clamped down on his brain and the scars on the back of his leg—the raised dots and dashes like Morse code on his skin—served as a reminder that dogs were dangerous.

From "Look Both Ways" by Jason Reynolds