Pronunciation: (bôl'su, bäl'-), [key]
1. a tropical American tree, Ochroma pyramidale (lagopus), of the bombax family, yielding an exceedingly light wood used for life preservers, rafts, toy airplanes, etc.
2. a raft made of balsa wood.
3. any life raft.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.