noun. a fibrous scleroprotein that occurs in the outer layer of the skin and in horny tissues such as hair, feathers, nails, and hooves.
1. Verb, past tense Make ceratin the weight of the unit is adequately supported. 2. Noun, singular or mass But it is a simple asphyxiant, so in ceratin cases a release of a large volume of argon can pose a hazard of asphyxiation.
