Etymology
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puka

type of necklace made from small shell fragments (or plastic imitations), by 1974, from Hawaiian puka, said to mean literally "hole," in references to small shell fragments with naturally occurring holes through them, suitable for stringing, found on beaches.

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Definitions of puka

puka (n.)
South American shrub or small tree having long shining evergreen leaves and panicles of green or yellow flowers;
Synonyms: Griselinia lucida
puka (n.)
small roundheaded New Zealand tree having large resinous leaves and panicles of green-white flowers;
Synonyms: Meryta sinclairii
From wordnet.princeton.edu