- any of numerous orthopterous insects of the family Blattidae, characterized by a flattened body, rapid movements, and nocturnal habits and including several common household pests.
- any insect of the suborder Blattodea (or Blattaria), such as Blatta orientalis (oriental cockroach or black beetle): order Dictyoptera ., They have an oval flattened body with long antennae and biting mouthparts and are common household pests
