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The Collaborative International Dictionary of English v.0.48:

Hygroplasm \Hy"gro*plasm\, n. [Gr. ? wet + ? form, mold.] (Biol.) The fluid portion of the cell protoplasm, in opposition to stereoplasm, the solid or insoluble portion. The latter is supposed to be partly nutritive and partly composed of idioplasm. [1913 Webster]