Relating to or characteristic of arachnids or the class Arachnida.
From 'Arachnida' + '-ial' (adjectival suffix meaning 'relating to'). A technical term used in zoology and entomology when describing arachnid features.
The arachnidial body plan—eight legs, two body segments, and no antennae—has been so successful that arachnids have dominated as predators for over 400 million years!
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