a valve in a carburetor that consists of a disc that turns and acts as a throttle
a swimming stroke in which the arms are thrown forward together out of the water while the feet kick up and down
flutter like a butterfly
diurnal insect typically having a slender body with knobbed antennae and broad colorful wings
a structure in a hollow organ (like the heart) with a flap to insure one-way flow of fluid through it
device in a brass wind instrument for varying the length of the air column to alter the pitch of a tone
control consisting of a mechanical device for controlling the flow of a fluid
one of the paired hinged shells of certain molluscs and of brachiopods
