noun
translucency; translucence
Technical term used in materials science, optics, and related fields to describe the property of allowing light to pass through diffusely.
この素材は透光性が高いため、照明カバーに適している。
This material has high translucency, making it suitable for lighting covers.
半透明 is the more common everyday word for translucent or semi-transparent; 透光性 is a formal, technical noun for the property of translucency.
Compound of 透 (transmit, penetrate), 光 (light), and 性 (property, nature). A modern technical coinage.