| BAL | a medical instrument that measures the mechanical force of cardiac contractions and the amount of blood passing through the heart during a specified period by measuring the recoil of the body as blood is pumped from the ventricles |
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| BAL | one of the two male reproductive glands that produce spermatozoa and secrete androgens |
| BAL | large tough non-rigid bag filled with gas or hot air |
| BAL | small thin inflatable rubber bag with narrow neck |
| BAL | become inflated |
| BAL | ride in a hot air balloon |
| BAL | fragrant puffed-up white to reddish-pink flowers in long narrow clusters on erect stems |
| BAL | any light loose sail |
| BAL | a seat that has a bell shape (on some 18th century chairs) |
| BAL | woody perennial climbing plant with large ornamental seed pods that resemble balloons |
| BAL | similar to but smaller than porcupinefish |
| BAL | flying in a balloon |