- a vessel used to patrol a harbor.
Origin of picket boat
First recorded in 1865–70
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for picket boat
This boat was later further demolished by a gallant British picket-boat attack.The Story of Our Submarines
John Graham Bower
Even the commonplace precaution of sending out a picket-boat had not been taken.The Gulf and Inland Waters
A. T. Mahan
I remember the same thing occurring on the 'Tremendous's' picket-boat Yes, they're switching off.Billy Barcroft, R.N.A.S.
Percy F. Westerman