- noun a chance; lucky event
- A long-lived parasitic flatworm which infects vertebrate (including human) livers, lungs and brains, causing a variety of diseases. The eggs are shed in faeces. The larval stages first infect snails, then pass to aquatic plants, shellfish and fish from whence they reinfect the vertebrates. freezing kills the larvae but raw freshwater fish, shellfish and unwashed aquatic plants represent the greatest danger to both tourists and the more affluent countries which import them unfrozen.
- noun a parasitic flatworm which settles inside the liver, in the bloodstream and in other parts of the body