IPA: /əˈɡliːm/
KK: /əˈɡlim/
Shining brightly, especially with light that is reflected.
The stars shone agleam in the night sky.
Comparative: more agleam
Superlative: most agleam
Shining brightly or glimmering with light.
The stars were agleam in the night sky.
Agleam is formed from the prefix "a-" (meaning in a state of) and "gleam" (from Old English "glēam", meaning a bright light or shine). The word "agleam" means in a state of shining or glowing brightly.
Imagine something that is 'in a state of' shining brightly — that's what 'agleam' means.