raft

Definitions

• A flat-bottomed craft able to float and drift on water, used for transport or as a waterborne platform.
• (by extension) Any flattish thing, usually wooden, used in a similar fashion.
• A thick crowd of seabirds or sea mammals, particularly a group of penguins when in the water.
• (US) A collection of logs, fallen trees, etc. which obstructs navigation in a river.
• (US) A slice of toast.
• A square array of sensors forming part of a large telescope.