Definitions of arachnid
  1. noun
    air-breathing arthropods characterized by simple eyes and four pairs of legs
    synonyms: arachnoid
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    Phalangium opilio, daddy longlegs, harvestman
    spiderlike arachnid with a small rounded body and very long thin legs
    arachnid of warm dry regions having a long segmented tail ending in a venomous stinger
    false scorpion, pseudoscorpion
    small nonvenomous arachnid resembling a tailless scorpion
    whip scorpion, whip-scorpion
    nonvenomous arachnid that resembles a scorpion and that has a long thin tail without a stinger
    predatory arachnid with eight legs, two poison fangs, two feelers, and usually two silk-spinning organs at the back end of the body; they spin silk to make cocoons for eggs or traps for prey
    mite or tick
    Chelifer cancroides, book scorpion
    minute arachnid sometimes found in old papers
    Mastigoproctus giganteus, vinegarroon
    large whip-scorpion of Mexico and southern United States that emits a vinegary odor when alarmed
    orb-weaving spider
    a spider that spins a circular (or near circular) web
    Argiope aurantia, black and gold garden spider
    a widely distributed North American garden spider
    Araneus cavaticus, barn spider
    an orange and tan spider with darkly banded legs that spins an orb web daily
    Aranea diademata, garden spider
    a spider common in European gardens
    comb-footed spider, theridiid
    spider having a comb-like row of bristles on each hind foot
    Latrodectus mactans, black widow
    venomous New World spider; the female is black with an hourglass-shaped red mark on the underside of the abdomen
    large hairy tropical spider with fangs that can inflict painful but not highly venomous bites
    hunting spider, wolf spider
    ground spider that hunts its prey instead of using a web
    trap-door spider
    American spider that constructs a silk-lined nest with a hinged lid
    any of two families of small parasitic arachnids with barbed proboscis; feed on blood of warm-blooded animals
    any of numerous very small to minute arachnids often infesting animals or plants or stored foods
    type of:
    invertebrate having jointed limbs and a segmented body with an exoskeleton made of chitin
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