pith helmet

noun

a hat made of dried pith or cork covered with cloth, worn in the tropics.

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British Dictionary definitions for pith helmet

pith helmet

noun

a lightweight hat made of pith that protects the wearer from the sunAlso called: topee, topi

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012