With participation level at nearly a quarter of the population (22 percent), bowling rolled by such popular sports and activities as basketball (15 percent), golf (13 percent), aerobics (11.9 percent), baseball (13 percent) and yoga (9 percent) to secure the number one ranking.
Definition of FUEL CELL. : a device that continuously changes the chemical energy of a fuel (as hydrogen) and an oxidant directly into electrical energy.
Noun. 1. flame cell-organ of excretion in flatworms. flatworm, platyhelminth-parasitic or free-living worms having a flattened body. excretory organ, urinary organ-an organ that separates waste substances from the blood and discharges them.1  Facebook. 2  Twitter. hollow cell in the excretory system of certain invertebrates, including flatworms and rotifers, containing a tuft of rapidly beating cilia that serve to propel waste products into excretory tubules.