Galley
The pre-publication copies sent to the author for final proofreading or to reviewers for pre-publication reviews.

Genre
A specific category of literature, marked by a distinctive style form or content.

Glossary
A list of terms and definitions particular to the subject of the book.

Graphics
The non-type parts of a book such as drawings, illustrations, photographs, charts, etc. that are used to enhance the content of a book.

Gutter
The blank space that separates the type on facing pages of a book.