Dictionary.com
definitions
  • synonyms

ultrathin

[uhl-truh-thin]
See more synonyms on Thesaurus.com
adjective
  1. extremely thin: an ultrathin wristwatch.

Origin of ultrathin

First recorded in 1945–50; ultra- + thin
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018