In ancient Greek clothing, a fine veil or covering worn over the head and shoulders by women, or in biology, a protective outer layer or covering.
From Greek 'kalymma' meaning veil, covering, or that which conceals, used both for the historical garment and borrowed into scientific terminology for protective biological structures.
The same Greek word 'kalymma' described both a woman's delicate veil in ancient Athens *and* the protective outer layer of certain marine organisms—showing how the Greeks found poetry in describing natural protection.
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