an antenna that transmits its radiation in a particular direction.
- Beam aerial
noun an aerial system, such as a Yagi aerial, having directional properties Also called (esp US) beam antenna
- Beam brick
a face brick for bonding to a concrete lintel poured in place, having a section like a right triangle.
- Beam compass
a compass having adjustable legs, set perpendicular to the paper and sliding along a horizontal bar so as to permit the drawing of large circles. noun an instrument for drawing large circles or arcs, consisting of a horizontal beam along which two vertical legs slide Also called trammel
- Beam fill
material, as concrete, for filling spaces between beams or joists in or on top of a masonry wall.