GNU Collaborative International Dictionary of English

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  1.       
‖Zona (?), n.; pl. Zonae (?). [L., a girdle.  See Zone.] A zone or band; a layer.

    [1913 Webster]

    Zona pellucida. [NL.] (Biol.) (a) The outer transparent layer, or envelope, of the ovum. It is a more or less elastic membrane with radiating striae, and corresponds to the cell wall of an ordinary cell.  See Ovum, and Illust. of Microscope. (b) The zona radiata. -- Zona radiata [NL.] (Biol.), a radiately striated membrane situated next the yolk of an ovum, or separated from it by a very delicate membrane only.

    [1913 Webster]

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