A flat expanse of floating ice smaller than an ice field.(noun)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
Use "ice floe" in a sentence
"The Milne Ice Shelf is the largest solid ice floe in the Northern Hemisphere."