An official mark or series of marks struck on items made of metal, mostly to certify the content of noble metals.

A relatively small chiefly gray toothed whale (Tursiops truncatus) of temperate to tropical waters that has a prominent beak and falcate dorsal fin, reaches a length of 6 to 12 feet (1.8 to 3.6 meters).

A thing (of a liquid) contain bubbles of air or gas rising to the surface.

A consequence applied that will strengthen an organism's future behavior or an structure whenever that behavior is preceded by a specific antecedent stimulus

The larva of an insect, especially a beetle.

A swelling of a part of the body, generally without inflammation, caused by an abnormal growth of tissue, whether benign or malignant.

For the most part; mainly.

The ability or tendency to float in water or air or some other fluid.

See, notice, or recognize (someone or something) that is difficult to detect or that one is searching for.