arachnisexual Share definition Flag An individual who is attracted to aroused by spiders. That guy's obessession with tarantula's could really mean he is an arachnisexual--he prefers spiders over people. arachnisexual by msknowitall January 26, 2013 0 0 Get merch Get the arachnisexual mug. Buy Now — $32.95 See more merch