luco-, luc-, luci-, lux, -lucence, -lucent
(Latin: light, lights, shine, shines, shining)
2. Shining by night; as with a noctilucent cloud, a cloud of a kind that occasionally is seen at night in the summer in high latitudes, which occurs in the mesopause (atmosphere) and which some authorities believe is composed purely of cosmic dust and others of ice condensed around cosmic dust particles.
3. Designating or of a luminous cloud of unknown composition, visible at night in the polar regions at an altitude of around 50 miles.
2. A term used to describe high clouds that are visible at night: Standing on the hilltop at sunset, people could see the noctilucent clouds flowing eastward ahead of the wind.
2. Regarding something which does not allow light to pass through: The windows were painted black so they would be opaque, thus permitting the photographer to work in his photo-processing laboratory without unwanted illumination.
2. Characteristic of something self-evident; obvious; apparent: Trina's facial expression was so transparent that Susan always knew what she was thinking.
The information from the lecture was completely opaque to Ryan and so he couldn't understand a thing.
After Howard read the text book, his mind felt more translucent, as if some light on the subject was getting through and the information was beginning to make sense, but not completely.
Then, after Marla asked for an explanation, the answer suddenly became transparent.
2. Easy to understand; clear and simple in style: Carson decided that the online dictionaries which he was using did not provide the most pellucid explanations and illustrations that he was looking for because they had a tendency to use another form of the same word being defined.
3. Permitting the passage of radiant splendor to shine through: The beautiful pellucid stained glass windows in the room cast a soft glow of light in the afternoon.
2. Casting back light; shining, gleaming, bright, refulgent.
Motto of Buxton College, U.K.
Motto of Tarkio College, Missouri, USA.