It means giving off light at night. See previous answer.
Noctilucent is a “cloud-like” concept. “The short summer nights of latitudes of 50 – 65° reveal the highest clouds – noctilucent or ‘night shining’ clouds. They are colourless or bluish-white. They can be skein-like, rich with undulations, currugations, knots and streaks clawing upwards into the sky, at other times they lie close to the horizon as a featureless band.” For more information or to see photos of noctilucent check out: http://www.atoptics.co.uk/highsky/nlc1.htm
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