The hard, outer protective coverings of sea creatures like clams, snails, and oysters, often found washed up on beaches.
Compound of 'sea' (ocean) and 'shell' (hard outer covering). Shells come from Old English 'scell,' related to 'scale.'
Seashell patterns follow mathematical spirals found throughout nature—the same geometry appears in galaxies, hurricanes, and DNA, suggesting a universal design principle in the universe.
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