A few butterflies and many moth species spin a silk case or cocoon prior to pupating, while others do not, instead going underground. A butterfly pupa, called a chrysalis, has a hard skin, usually with no cocoon.
4. tension - (physics) a stress that produces an elongation of an elastic physical body; the direction of maximum tension moves asymptotically toward the direction of the shear. natural philosophy, physics-the science of matter and energy and their interactions; his favorite subject was physics.
Medical Definition of TENSION. 1. b: stress 1b. 2. a: either of two balancing forces causing or tending to cause extension b: the stress resulting from the elongation of an elastic body. 3. : inner striving, unrest, or imbalance often with physiological indication of emotion.xamples of TENSION. 1  You can see she is just filled with tension about her job. 2  The dramatic tension was very satisfying. 3  The author resolves the tension too soon. 4  Political tensions in the region make it unstable. 5  Do you sense the tension between those two? 6  There was a lot of tension at the meeting. 7  The book describes the tension-filled days 8  ... H