| Noun | 1. | insect - small air-breathing arthropod order Thysanura, Thysanura - firebrats; silverfish; machilids bristletail - small wingless insect with a long bristlelike tail Lepisma saccharina, silverfish - silver-grey wingless insect found in houses feeding on book bindings and starched clothing jumping bristletail, machilid - wingless insect living in dark moist places as under dead tree trunks; they make erratic leaps when disturbed |