Boyd’s Bible Dictionary:
A stormy northeast wind of the Levant (Acts 27:14).
Concise Bible Dictionary:
The name used by the sailors for a tempestuous wind in the Mediterranean, experienced when Paul was being taken to Rome (Acts 27:14). The etymology of the word is not known: some MSS read εὐρακύλων, euraquilo. It may simply imply a furious wind, like a Levanter in modern times, irrespective of the quarter from where it blew.
Jackson’s Dictionary of Scripture Proper Names:
an easterly tempest