Entry 1 sense Webster, 1913 Hydro-extractor · Hy·dro-ex·tract·or · IPA 01 n. An apparatus for drying anything, as yarn, cloth, sugar, etc., by centrifugal force; a centrifugal. 1. An apparatus for drying anything, as yarn, cloth, sugar, etc., by centrifugal force; a centrifugal.