/ˈspaɪdər/
[noun] A small creature with eight legs that spins webs to catch insects for food. Spiders are not insects but belong to a separate group called arachnids.
The word 'spider' is literally 'the spinner' — its entire name is built around the one thing it famously does.
The word 'spider' is one of those wonderfully transparent words whose meaning is hidden in plain sight. It comes directly from the Old English verb 'spinnan', meaning 'to spin', through the Old English form 'spīthra' or 'spīþra', which essentially meant 'the spinner' or 'one who spins'. The connection is obvious once you see it: the spider was simply named after the most striking thing it does — the almost magical act of pulling silk from its own body and weaving it into a web.
The root 'spinnan' in Old English belonged to a much larger family of Germanic spinning words. It gave rise to 'spindle', the pointed rod used in hand-spinning wool, and it flows through Middle English 'spinnen' into the modern English verb 'spin'. The Old English 'spīthra' gradually shifted in pronunciation and spelling over the centuries, moving through Middle English forms like 'spydyr' and 'spither' before settling into the familiar 'spider' we use today by around the 14th and 15th centuries.
What makes this etymology particularly satisfying is how different it is from other European languages. The French word for spider, 'araignée', comes from Latin 'aranea', which is also the source of the scientific word 'arachnid' — the biological class that includes spiders, scorpions, and mites. The Latin 'aranea' connects to the ancient Greek myth of Arachne, a mortal weaver so talented that she challenged the goddess Athena to a weaving contest. When Arachne's work proved equal to the goddess's, Athena transformed her into a spider, doomed to spin and weave forever. So while the Romance languages remembered the creature through myth, the Germanic languages simply looked at what it did and named it plainly.
In Proto-Germanic, the ancestor language of Old English and its relatives, the root was something like '*spinnaną', meaning to spin or draw out thread. This same root spread across the Germanic family: Old High German had 'spinnan', Old Norse had 'spinna', and Dutch had 'spinnen' — and the Dutch word for spider, 'spin', makes the connection almost embarrassingly clear, as it is identical to the verb itself. German, similarly, calls the spider 'Spinne', and the German verb 'spinnen' means both to spin thread and, in a slang sense, to be crazy — perhaps because the endless, obsessive weaving of a spider struck people as a little manic.
Beyond the creature itself, the word 'spider' has spun its own web of related meanings in English. By the 17th century, a 'spider' could refer to a cast-iron frying pan with three long legs — the legs resembling a spider's limbs as it stood over a fire. In modern computing, a 'web spider' or 'web crawler' is a program that moves automatically through the internet, following links just as a spider moves along the threads of its web. The metaphor, rooted so firmly in that ancient act of spinning, has proven extraordinarily durable — from Old English hearths to server farms, the spinner's name has kept its shape.