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| an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle. |
| a gadget; dingus; thingumbob. |
| trap-door spider | |
| —n | |
| any of various spiders of the family Ctenizidae that construct a silk-lined hole in the ground closed by a hinged door of earth and silk | |
trap-door spider
any member of the spider family Ctenizidae and certain members of the families Antrodiaetidae, Actinopodidae, and Migidae (order Araneida). Trap-door spiders construct burrows in the ground; at the entrance they build a silken-hinged door. The spider feeds by quickly opening the trap door and grabbing an insect that is passing close by
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