Saddle Stitching
Stitching where the wire staples pass through the spine from the outside and are clinched in the center. Only used with folded sections, either single sections or two or more sections inset to form a single section.  Also called pamphlet stitch, saddle wire, and stitch bind.

Safety Paper
A paper that shows sign of erasure so that it cannot be altered or tampered with easily.

Sans Serif
A typeface that has no serifs (small strokes at the end of main stroke of the character).

Satin Finish
A dull finish on coated paper.

Scaling
The enlargement or reduction of an image or copy to fit a specific area.

Scoring
Pressing a channel into a sheet of paper to allow it to fold more easily. Scoring and pressing the paper fibers together creates an embossed channel that acts as a guide for easier folding.

Screen Angles
The placement of halftone screens to avoid unwanted moire patterns. Frequently used angles are black 45deg, magenta 75deg, yellow 90deg, and cyan 105deg.

Screen Ruling
A measurement equaling the number of lines or dots per inch on a halftone screen.

Self Cover
A cover made out of the same paper stock as the internal sheets.

Self Mailer
A printed item capable of travel in the mail without an envelope.

Separations
In the four-color print process,  in order to reproduce color and continuous-tone images, artwork is usually separated into four plates—one plate for each of the cyan (C), yellow (Y), magenta (M), and black (K) portions of the image. When inked with the appropriate color and printed in register with one another, these colors combine to reproduce the original artwork. The process of dividing the image into two or more colors is called color separating, and the films from which the plates are created are called the separations.  Can also separate specific PMS colors through film. Using electronic prepress,  separations can be shown on the computer screen to proof the plates.

Serif
(1) small cross stroke at the end of the main stroke of the letter. (2) a font with these strokes.

Set Solid
Type set without leading (line spacing) between the lines.

Shadow
The darkest areas of a photograph. 

Shadow Dot
The lowest density of a halftone image.

Sharpen
To decrease the dot size of the halftone which in turn decreases the color strength.

Sheetfed Press
Press that prints sheets of paper, as compared to a web press.

Sheetwise
The printing of two different images on two different sides of a sheet of paper by turning the page over after the first side is printed and using the same gripper and side guides.

Shingling
Allowance, made during paste-up or stripping, to compensate for creep. Creep is the problem; shingling is the solution. Also called stair stepping and progressive margins.

Show Through
A problem that occurs when the printing on one side of a sheet is seen from the other side.

Side Guide
The guides on the sides of the sheet fed press that position the sheet sideways as the paper is led towards the front guides.

Side Stitching
Stitching where the wire staples pass through one side of a pile of sections or leaves gathered upon each other and are clinched on the undersides. Also called cleat stitch and side wire.

Signature
Printed sheet (or its flat) that consists of a number of pages of a book, placed so that they will fold and bind together as a section of a book. The printed sheet after folding.

Slitting
A term to describe the process of cutting of printed sheets by the cutting wheels of a printing press.

Small Caps
A set of capital letters that are smaller than standard and are equal in size to the lower case letters for that type.

Smoothness
That quality of paper defined by its levelness which allows for pressure consistency in printing, assuring uniformity of print.

Soft Dot
An excessively large halo around a dot in a photograph that causes a fringe that diminishes the dot intensity.

Solid
Any area of the sheet receiving 100 percent ink coverage, as compared to a screen tint.

Soy Inks
Inks made with soy oils instead of petroleum as the base. They are considered to be more environmentally friendly, a standard component of green printing.

Specifications
Complete and precise written description of features of a printing job such as type size and leading, paper grade and quantity, printing or binding method. Abbreviated as 'specs.'

Spine
Back or binding edge of a book or publication.

Spiral Bind
Binding using a spiral of continuous wire or plastic looped through punched holes.  Also called coil bind.

Split Run
Split run is the printing of a book or booklet that has some copies bound one way and other copies bound another way.

Spoilage
Paper that, due to mistakes or accidents, must be thrown away instead of delivered printed to the customer, as compared to waste.

Spot Color
Small area printed in a second color, usually a specified Pantone.

Spot Varnish
Varnish used to highlight a specific part of the printed sheet. 

Spread
(1) Two pages that face each other and are designed as one visual or production unit. (2) Technique of slightly enlarging the size of an image to accomplish a hairline trap with another image.

Stabbing
To bind a series of pages with wire staples such that staples enter from the front and back simultaneously, neither side being long enough to exit the opposite side.

Stagger Cutting
A process of cutting many sheets from the same parent sheet in which the smaller sheets have different grain directions; also called dutch or bastard cutting.

Star Target
The Graphic Arts Technical Foundation, GATF has established various quality control images; the star target appears along with the color bar and helps the pressman detect any irregularity in the ink spread. 

Stem
The main vertical stroke making up a type character.

Step and Repeat
A process of generating multiple exposures by taking an image and stepping it according to a predetermined layout.

Stock
A term for unprinted paper.

Stumping or Blocking
Impressing book covers, etc., by means of hot die, brass types, or blocks.

Substrate
Any surface or material on which printing is done.

SWOP
Abbreviation for specifications for web offset publications, specifications recommended for web printing of publications.

Synthetic Papers
Any petroleum based waterproof papers with a high tensile strength.