a sweet innocent baby
an angel of the second order whose gift is knowledge; usually portrayed as a winged child
A winged creature attending God, described by Pseudo-Dionysius the Areopagite (c. 5th–6th century) as the second highest order of angels, ranked above thrones and below seraphim; similar to a lamassu in the pre-exilic texts of the Hebrew Bible, more humanoid in later texts.
The word "cherub" comes from the Latin cherūbīm, which was borrowed from Ancient Greek and originally derived from the Hebrew k'ruvím. It first entered English via Old English to mean an angel of the second highest order.