— arachnidan /euh rak"ni deuhn/ , adj. , n.
/euh rak"nid/ , n.
1. any wingless, carnivorous arthropod of the class Arachnida, including spiders, scorpions, mites, ticks, and daddy-longlegs, having a body divided into two parts, the cephalothorax and the abdomen, and having eight appendages and no antennae. Cf. insect .
adj.
2. belonging or pertaining to the arachnids.
[ 1865-70; Arachnida aráchn ( e ) spider, spider's web + NL -ida -IDA ]