What is "extender"

Extender \Ex*tend"er\, n. One who, or that which, extends or stretches anything.

1610s, agent noun from extend (v.). Middle English had extendour "surveyor, assessor."

n. 1 Any of various substances designed to extend any of several properties of a material. 2 Any of various components designed to extend the length of a device. 3 Any substance added to food to bulk it out, with a higher protein content than a filler. 4 (context climbing English) A runner, or quick-draw. (from sense #2) 5 (context linguistics English) A phrase that extends an expression to include further members of a set, e.g. "and stuff", "or something".

Extender may refer to:

• DOS extender, a technology for bypassing the limitations of the DOS operating systems family
• Extender (ink), a transparent material added to printing inks
• KC-10 Extender, an air-to-air tanker aircraft
• Meat extenders
• Media extender
• Seafood extender or Surimi
• Tele extender, a secondary lens for SLR cameras
• Quickdraw or extender, a piece of climbing equipment used by rock and ice climbers to allow the climbing rope to run freely through bolt anchors or other protection while leading,
• Extender (set theory)

In set theory, an extender is a system of ultrafilters which represents an elementary embedding witnessing large cardinal properties. A nonprincipal ultrafilter is the most basic case of an extender.

A -extender can be defined as an elementary embedding of some model M of ZFC (ZFC minus the power set axiom) having critical point κ ε M, and which maps κ to an ordinal at least equal to λ. It can also be defined as a collection of ultrafilters, one for each n- tuple drawn from λ.

An extender, also known as a filler,

in printing ink technology is a white transparent, or semi-transparent, component whose purpose is to reduce the cost of the ink, by increasing the area covered by a given weight of pigment.

They generally have little colouring power.