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triphibious

[trahy-fib-ee-uh s]
adjective
  1. employing or involving land, naval, and air forces in a combined operation.
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Also triphibian.

Origin of triphibious

First recorded in 1940–45; tri- + (am)phibious
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for triphibious

triphibious

adjective
  1. (esp of military operations) occurring on land, at sea, and in the air
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Word Origin

C20: from tri- + (am) phibious
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