Is there an etymological connection between words like "arachnid" (related to spiders) and words like "arachidonic" (related to peanuts)?
closed as off-topic by tchrist♦, FumbleFingers, Drew, Misti, Edwin Ashworth Jan 21 '15 at 21:30
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No, I think there is none. Arachnid comes from Greek arakhne "spider; spider's web," which probably is cognate with Latin aranea "spider, spider's web" (Etymonline), while arachidonic is connected to arachis – from New Latin: genus that includes the peanut, from Greek: arakis, diminutive of arakos, a legume (Merriam-Webster).