(humorous) Vibrator (device designed to stimulate a woman's genitals).

(philately) Back-of-the-book; denoting those stamps in a catalogue that are not used for the payment of regular postage fees, and are displayed separately in the catalogue after that listing; the division between these two groups varies with the publisher.

(Incoterm) without charge to the purchaser for delivery on board a carrier (originally a ship), at a specified location or point; used in such phrases as FOB destination to specify the point where the title of goods passes from the seller to the buyer

A tropical bird, Phaethon aethereus, often found far from land, whose cry resembles the whistle of a boatswain's pipe.

(nautical) The group of sailors who were selected to board an enemy ship and, when in control, to make such repairs to rigging and sail that the ship could be taken to port as a prize

A pupil who lives at school during term time. / Someone who pays for meals and lodging in a house rather than a hotel. / One who boards a vehicle.

(computing, Macintosh) A motherboard.

present participle of board

the act of people getting aboard a ship aircraft, train, bus etc.; embarkation / the act of a sailor or boarding party attacking an enemy ship by boarding it / a structure made of boards

The officer (or warrant officer) in charge of sails, rigging, anchors, cables etc. and all work on deck of a sailing ship. / The petty officer of a merchant ship who controls the work of other seamen.