Definition of transparency

i. The degree to which visible light is transmitted through a solid. A mineral is termed transparent if objects can be clearly seen through it, as through glass; e.g., rock crystal (quartz), selenite (gypsum), Iceland spar (calcite), and gem diamond.

Synonym of: diaphaneity

ii. The capacity of seawater to transmit light; the depth to which water is transparent may be measured by use of a Secchi disc.

iii. A positive image, either black and white or in color, on a clear base (glass or film), intended to be viewed by transmitted light; a diapositive.