Guy: A rope used to prevent a boom swinging aboard either fore or aft. In running before the wind a guy is often attached to the main boom of a schooner to prevent a sudden gybe.
Gybe: When running before the wind, to bring the wind on the other side by putting up the helm, and thereby cause the sails to fall over.
Halyards: The ropes used to hoist sails, yards, etc.
Hatches: Openings in the decks.
Haul aft a sheet: To haul a sail flatter or at a less angle to the wind.
Haul her wind: Said of a vessel going free, when she comes up closer to the wind and flattens her sheets.
Helm: Generally applied to the tiller, but properly it means the whole apparatus for steering.
Housed: The situation of a topmast that has been lowered.
In irons: A vessel is said to be in irons when in going about she comes up head to wind, and will not fill off one way or the other.