Fibre. An organic filament or thread.

Filament. A thread-like appendage.

Fissure. A deep, narrow depression.

Flatulence. Afflicted with gas in the alimentary canal.

Flexion. The act of bending.

Fluctuation. The undulation of fluid when pressed.

Fœtus. The young viviparous animal in the womb.

Follicle. A small secreting sac.

Fomentations. The application of hot cloths wet with hot water or medicated liquors.

Forearm. The part of the upper extremity between the elbow and hand.