Definition:
1. n. The fourth, or adult, stage in the life of certain insects, such as the butterfly or moth. Source: Durrell, G. and L. Durrell. 'A Practical Guide for the Amateur Naturalist'. Alfred A. Knopf, New York, 1989.
2. n. The adult stage of an insect. Source: Rickleffs, R.E. 'Ecology (3rd Edition)'. W.H. Freeman & Co Ltd. New York. 1990.
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