Floe
/fləʊ/
Definition 1 of 1
Pro Tip 1/3Visual Imagery
Imagine a giant, flat piece of ice, like a natural raft adrift in the ocean. 
The polar bear climbed onto the floe to rest.
Pro Tip 2/3Size Context
Floes are much larger than ice cubes but smaller than glaciers, usually seen in polar seas. 
The ship navigated carefully to avoid the large floes.
Pro Tip 3/3Not Solid Land
A floe is not stable ground; it's temporary and can move or melt. 
The seal used the floe for sunbathing, knowing it might drift.