What is a pitch in a ship?

Rise and fall of a Vessel

"Pitch and Yaw" (Movement)

Pitch; to dip and raise its bow and stern alternately.

Yaw; to roll from side to side alternately.

Also,

General term meaning Tar

1. Any of various thick, dark, sticky substances obtained from the distillation residue of coal tar, wood tar, or petroleum and used for waterproofing and caulking.

2. Any of various natural bitumen's, such as mineral pitch or asphalt. 3. A resin derived from the sap of various coniferous trees, as the pines.