A tall casement window that reaches to the floor and opens like a door. It is a popular accent that brings more light into a home.
French drain
A covered ditch containing a layer of fitted or loose stone or other pervious material.
Freon
A registered trademark for a cholorfluorocarbon (CFC) gas that is highly stable and that has been historically used as a refrigerant.
Frequency
(1) The fact of occurring often or repeatedly. (2) The number of periodic vibrations or waves per unit of time, expressed in cycles per second. (3) Electrical cycles per second, called Hertz (Hz).
Frequency meter
Measurement device for alternating current frequency of an electrical circuit, in cycles per second.
Frequency modulation
Radio carrier wave frequency variation.
Fresco
The art of painting on wet plaster or a painting or design, which was made in that manner.
Fresnel lens
An optical device for concentrating light that is made of concentric rings that are faced at different angles so that light falling on any ring is focused to the same point.
Fret
(1) An ornamental pattern of small, straight bars which intersect or join together at right angles, forming a regular, repetitive design. (2) Any of several narrow crossbars fixed on the finger board of a banjo, guitar, etc. to regulate the fingering.
Fretwork
An ornamental pattern of small, straight bars which intersect or join together at right angles, forming a regular, repetitive design.
