Roundworm \Round"worm`\, n. (Zo["o]l.) A nematoid worm.
roundworm n 1: infections of the skin or nails caused by fungi and appearing as itching circular patches [syn: {tinea}, {ringworm}] 2: unsegmented worms with elongated rounded body pointed at both ends; mostly free-living but some are parasitic [syn: {nematode}, {nematode worm}]