Definition of springtail
: any of an order (Collembola) of small primitive wingless arthropods that are either classified as insects or are placed in a related class (Entognatha), that have internal mouthparts enclosed in folds of the head, usually possess a furcula used for jumping, exhibit incomplete metamorphosis, feed especially on fungi and decaying vegetation, and are typically found in moist or wet surroundings (such as soil, on the surface of water or melting snow, or in caves) —called also collembolan
First Known Use of springtail
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