Aglitter means sparkling all over with light. The whole harbour was aglitter.
The a- at the front is an old prefix meaning in a state of, as in ablaze and afire. Aglitter goes after the verb rather than before the noun, which is what that prefix does.
1adjectiveaglitterSparkling all over with light.
“The frost left every field aglitter until about ten.”
aglitter is a quality.
Also accepted in games: spangled
Proto-Indo-European
*ǵʰley-
Proto-Germanic
*glitrōną — to glitter
Old Norse
glitra
Middle English
gliteren
English
glitter
English, today
aglitter
From a- + glitter. glitter comes from Middle English gliteren, from Old Norse glitra, from Proto-Germanic glitrōną (“to glitter”), from Proto-Indo-European ǵʰley-.
Etymology from Wiktionary, CC BY-SA