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signal board
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noun
a board for displaying electrically transmitted signals and indicating their source.
QUIZ
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Question 1 of 9
Which of the following nouns has an irregular plural form?
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Words nearby signal board
signa, signable, Signac, signage, signal, signal board, signal box, signal corps, signal generator, signalize, signally
Dictionary.com Unabridged
Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022