Spheroplast

A spheroplast is a gram-negative bacteriumfrom which the cell wall has been almost completely removed as by the action of penicillin. If a spheroplast is transferred to a hypotonic solution, it will lyse.

From Dorlans Medical Dictionary: "Spheroplast (sphe·ro·plast) a bacterial, yeast, or fungal cell that results after partial removal of the rigid cell wall, which forms a membrane-bound cell with a spherical shape that is dependent for its integrity on an isotonic or hypertonic medium."

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It uses material from the http://en.wikipedia.org/wiki/Spheroplast Wikipedia article Spheroplast.