Movable letter

(Heb. Gram.) a letter that is pronounced, as opposed to one that is quiescent.

See also: Movable

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References in classic literature ?
He had been trained to this by the gypsy, who possessed, in these delicate arts, so rare a talent that two months had sufficed to teach the goat to write, with movable letters, the word "Phoebus.
There's something about that type of sign with movable letters that inspires strange messages.
A school corner holds a tiny, old-fashioned desk, a spelling board with movable letters, McGuffey's readers.