German: Bläschen. Zona pellucida. A now obsolete term applied by Baer for the thick translucent covering of the ovum, the vesicular ovarian follicle, which he described in 1827. The term is composed of the Greek word zone, meaning belt or girdle, plus the word pellucida which is derived from the Latin pelluceo meaning to shine or be transparent.
- K. E. von Baer:
De ovi mammalium et hominis genes. Leipzig 1827.
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