a gasket consisting of a flat ring of rubber or plastic; used to seal a joint against high pressure

a fat-soluble vitamin that prevents rickets

a degree on the centigrade scale of temperature

the act of traveling by foot

saliva spilling from the mouth

activity leading to skilled behavior

a metric unit of capacity, formerly defined as the volume of one kilogram of pure water under standard conditions; now equal to 1,000 cubic centimeters (or approximately 1.75 pints)

a radioactive metallic element that is similar to tellurium and bismuth; occurs in uranium ores but can be produced by bombarding bismuth with neutrons in a nuclear reactor

the circulating life energy that in Chinese philosophy is thought to be inherent in all things; in traditional Chinese medicine the balance of negative and positive forms in the body is believed to be essential for good health

running at a jog trot as a form of cardiopulmonary exercise