Outrageously Funny Word Dictionary :: Pertinaceous

👉 In biology, a pertinace refers to something that is essential for survival. For example, in a plant, it could be an essential nutrient or mineral. In animals, it may refer to an essential protein or carbohydrate that is necessary for growth and maintenance of health. In humans, it can be an essential hormone that plays a crucial role in maintaining bodily functions.

pertinaceous