You searched for: “further
farther, further
farther (FAR thur) (adverb)
Usually a reference to how much space dimension there is or how great a distance is, but it should be used only in connection with a physical or a "linear" distance: That town is farther away than William thought.
further (FUR thur) (adjective)
Not always differentiated from farther, but it should be used in referring to a degree, a quantity, or time in quality or degree: The students had to do further research in their project.

The simple rule is to use farther or farthest only when someone is talking about a measurable distance or space, otherwise use further to indicate greater in quantity, time, and degree.

In order to do further research for their geography class, the students went in search of a region that was farther away from their university town than the next village.

A unit related to: “further
(Greek: forward, further, onward; anterior)
Word Entries at Get Words: “further
further  (adjective) (not comparable)
1. Additional; more: Susan had further points to add to the program.
2. Rather distant; Sam saw his brother sitting on a chair at the further end of the hallway.
This entry is located in the following unit: further (page 1)
further  (adverb) (not comparable)
Referring to how something develops or results to a greater degree or extent: Tom didn't want to talk any further about his grades in school.
This entry is located in the following unit: further (page 1)
further  (verb), furthers; furthered; furthering
To help forward; to encourage; to support: Joe's parents wanted to further their son's education, so they enrolled him in college after he completed high school.
This entry is located in the following unit: further (page 1)
furtherest (adjective), further; furtherer; furtherest
Informel, non-standard, furthest; relating to something that is the most faraway place or thing: The elderly Mrs. Smith gold her grandson that the shop was the furtherest one from her home and that he should take his car and not walk, which would take a very long time.
This entry is located in the following unit: further (page 1)
A unit at Get Words related to: “further
(Old English: (first meaning), more forward; (current meaning), in addition, to a grater degree)