Extremely lightweight. This simile can be used to refer either to physical weight, as in This load is light as a feather, or to texture, as in This cake is light as a feather. [ Mid-1500s ]
[lahyt-bawrd, -bohrd] /ˈlaɪtˌbɔrd, -ˌboʊrd/ noun 1. (def 2).
[lahyt-boht] /ˈlaɪtˌboʊt/ noun 1. a small lightship.
noun, Military. 1. a small airplane designed to carry light bomb loads relatively short distances, especially one having a gross loaded weight of less than 100,000 pounds (45,000 kg).
noun 1. a boxlike object having a uniformly lighted surface, as of ground glass, against which films or transparencies can be held for examination. noun 1. a light source contained in a box and covered with a diffuser, used for viewing photographic transparencies, negatives, etc