An arthropod of the class Arachnida.
- black widow s. — see
latrodectus mactans . - brown recluse s. — a poisonous spider, Loxoceles reclusa, whose bite causes severe poisoning in humans.
- s. lily — see crinum.
- trapdoor s. — Atrax robustus. Called also funnel-web spider.
- s. grass — brachyachne convergens.
- s. lamb syndrome — inherited arachnomelia.
