arachnids
Concise Oxford English Dictionary © 2008 Oxford University Press:
arachnid /əˈraknɪd/
▶noun Zoology an arthropod of the class Arachnida, which includes spiders, scorpions, mites, and ticks.
– origin from mod. L. Arachnida, from Gk arakhnē ‘spider’.
'arachnids' also found in these Oxford entries:

