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One who speaks.
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Loudspeaker.
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Speakerphone.
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(politics) The chair or presiding officer of certain legislative bodies, such as the U.K. House of Commons or the U.S. House of Representatives.
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One who makes a speech to an audience.
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(US) A book containing passages of text for use in speeches.
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(especially in linguistics) The producer of a given utterance, whether speech or text.
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(music) A key on a woodwind instrument of the clarinet family (compare octave key on other instruments) which induces the instrument to overblow.
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(archaic) A wooden pole or spike used by hedgers to carry loads on their shoulders. Possibly Dorset dialect.