Coming or being from the east: easterly winds. (adjective)
A storm or wind coming from the east.(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 "easterly" in a sentence
"Weather disturbances in the trade winds, known as easterly waves, are another source of cloud development and precipitation in the tropics."
"Also, the wind anomaly shown by the arrows in the western area is easterly, which is consistent with development of a La Nina, if the wind persists."
"The Borneons, from being so harassed by these pirates, call the easterly wind 'the pirate wind.'"