fac-, facil-, fact-, feas-, -feat, -fect, -feit, -facient, -faction, -fic-, -fy, -ficate, -fication

(Latin: to make, to do, to build, to cause, to produce; forming, shaping)

putrefier
That which makes something rotten or causes decomposition and decay; often with malodorous results.
putrefy, putrefies
1. To make putrid, rotten, and foul.
2. To undergo putrefaction or decomposition.
3. To be broken down by bacterial action and so, to decay, producing a strong, unpleasant smell.
qualification
qualifier
qualify
ramifactive
1. A usually unintended consequence of an action, decision, or judgment that may complicate the situation or make the intended result more difficult to achieve.
2. The process of dividing or spreading out into branches.
3. A branch or arrangement of branches.
4. Forming, or developing into, a branch.
ramiferous
Bearing branches.
ramificate (verb), ramificates; ramificated; ramificating
To branch out.
ramification (s) (noun), ramifications (pl)
1. An unintended consequence of an action, decision, or judgment that may complicate a situation or make the intended result more difficult to achieve.
2. The process of dividing or spreading out into branches.
3. Collectively, the branches of trees.
ramifier
That which divides or spreads out into branches or branchlike parts; extending into subdivisions.
ramify (verb), ramifies; ramified, ramifying
1. To have complicating consequences or outgrowths.
2. To divide into or cause to extend into divisions or subordinate branchlike parts.
3. Of trees and plants or their parts; to form branches, to diverge out, to extend in the form of branches.
4. To extend or to spread into a number of subdivisions or offshoots analogous to branches; especially in the anatomy of veins, nerves, etc.
rarefaction
1. A decrease in density.
2. In acoustics, an area of expansion in a sound wave, the portion of a three0dimensional sound wave in which the medium compression that is due to acoustic energy is minimal and which, if measured as a standing waving of pressure versus time, would be a point at which the signal amplitude is minimum.
3. The process of decreasing in density and weight, as of air.

The farther from the surface of the earth, the less dense the atmosphere becomes.

rarefier
Something that becomes thinner or less dense.
rarefy
1. To make less dense.
2. To increase the porosity, or small openings, of something.
ratification