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)

terrifying (adjective)
1. Causing extreme terror.
2. Frightening or intimidating.
testificate
A writing wherein a fact is attested; a certificate.
testification
1. The action or an act of testifying.
2. The testimony given.
3. A fact or object; such as, a document, etc.; serving as evidence or proof.
testificator
Someone who testifies or attests; a testifier.
testify
1. To make a factual statement based on personal experience or to declare something to be true from personal experience.
2. To bear witness; to give evidence as a witness; to make a solemn declaration, under oath or affirmation, in a judicial inquiry, for the purpose of establishing or proving some fact.
thermal efficiency
1. A measure of the efficiency of converting a fuel to energy and useful work.
2. An expression of the effect of temperature on the rate of plant growth; assuming other condition are satisfactory.
3. The ratio of the amount of work performed by a heat engine in one cycle to the amount of thermal energy input required to operate the engine over one cycle; a measure of the efficiency of converting a fuel to energy and useful work.
torporific (adjective), more torporific, most torporific
Referring to a condition of mental or physical inactivity or insensibility: "The day long written exam at the university left Pete in the most torporific mental state he had ever experienced."
torrefaction; torrifaction (noun)
1. That which is dried or roasted with an anaerobic heat treatment; for example, to make wood waterproof.
2. The process of drying by exposure to heat or fire.
3. In pharmacy, the drying or roasting of drugs on a metalline plate, placed over or close to coals of fire, until they become friable to the fingers (easily crumbled or pulverized or reduced to powder), or until some other desired effect is produced.
torrefied rhubarb (noun)
Rhubarb that has had its purgative powers diminished by roasting; however, its astringency is not affected.

Astringency is the taste experience that takes place when a substance causes the mouth to pucker.

torrefied; torrified (adjective)
Dried or roasted: "They replaced a large percentage of the coal with torrefied wood which is a process of roasting wood chips in a large furnace to remove the moisture and make the product more brittle and easier to burn."
torrefy, torrefies, torrefied, torrefying; torrify, torrifies, torrified, torrifying (verb forms)
1. To dry drugs, ores, etc. by subjection to intense heat.
2. To dry or to roast by direct exposure to fire or to other sources of heat; to parch.
3. To dry or to parch; such as, drugs on a metallic plate until they are reduced to the condition desired.
4. Etymology: from French torréfier, from Latin torrefacere, which came from torrere, "to dry, to parch" + facere, "to make".
toxoinfection
triboelectrification (s) (noun), triboelectrifications (pl)
1. The separation of electrical charges through surface friction.
2. A process of charge separation that involves the rubbing together of dissimilar material surfaces; such as, blowing dust which may charge fences and other metallic objects to such an extent that slight shocks are felt when touched.

The triboelectric series is a classification scheme for the ordering of the tendency for positive charge acquisition in rubbing. The detailed physical mechanism in triboelectrification is a long unsolved problem.

tumefaction (s) (noun), tumefactions (pl)
1. The acts or processes of puffing or swelling.
2. The organic process whereby tissues become swollen by the accumulation of fluid within them.
tumefy (verb), tumefies; tumefied; tumefing
To swell or to cause something to swell or to get bigger.