蛔蟲
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}]