Toughened

verb

Definitions

Adjective
  1. 1
    made hard or flexible or resilient especially by heat treatment wordnet
  2. 2
    physically toughened wordnet
Verb
  1. 1
    simple past and past participle of toughen form-of, participle, past

    "Two large windows are provided in the front of the cab with a roller type of route indicator between them; both windows and indicator are fitted with ΒΌ-in.-thick toughened plate glass."

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