fist (fĭst)

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[Middle English, from Old English fȳst.]

noun 

1. The hand closed tightly with the fingers bent against the palm.
2. Informal A grasp; a clutch: had a fortune in their fists and let it go.
3. Printing See index

transitive verb: fist·ed, fist·ing, fists. 

1. To clench into a fist.
2. To grasp with the fist.
3. Vulgar To insert the fist into the rectum or vagina of (another) as a means of sexual stimulation.

in·dex (ĭńdĕkś)

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[Middle English, forefinger, from Latin.]

noun: pl., -dex·es or -di·ces (-dĭ-sēź) 

1. Something that serves to guide, point out, or otherwise facilitate reference, especially:
   1. An alphabetized list of names, places, and subjects treated in a printed work, giving the page or pages on which each item is mentioned.
   2. A thumb index.
   3. A table, file, or catalog.
   4. Computer Science A list of keywords associated with a record or document, used especially as an aid in searching for information.
2. Something that reveals or indicates; a sign: “Her face . . . was a fair index to her disposition” (Samuel Butler)
3. A character ([hand pointing right]) used in printing to call attention to a particular paragraph or section. Also called fist, hand
4. An indicator or pointer, as on a scientific instrument.
5. 1. Mathematics A number or symbol, often written as a subscript or superscript to a mathematical expression, that indicates an operation to be performed, an ordering relation, or a use of the associated expression.
   2. A number derived from a formula, used to characterize a set of data.
6. A number that represents the change in price or value of an aggregate of goods, services, wages, or other measurable quantity in comparison with a reference number for a previous period of time.
7. Roman Catholic Church A list formerly published by Church authority, restricting or forbidding the reading of certain books.

transitive verb: -dexed, -dex·ing, -dex·es. 

1. To furnish with an index: index a book.
2. To enter in an index.
3. To indicate or signal.
4. To adjust through indexation.

derivatives

ińdex́er

noun