FILLER
Source: 566, 567
filler. Filler, n. a person who or thing that fills, a horse
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Fill″er (?), n. One who, or that which, fills; something used for filling. 'T is mere filler, to stop a vacancy in the hexameter. Dryden. They have six diggers to four fillers, so as to keep the fillers always at work. Mortimer.