12-letter words containing a, f, i, r
- tie-off rail — trim rail.
- titaniferous — containing or yielding titanium.
- to play fair — If you say that someone plays fair, you mean that they behave or act in a reasonable and honest way.
- top grafting — grafting in the top, as of a tree, in order to replace existing branches with those of a more desired variety or form.
- torrefaction — to subject to fire or intense heat; parch, roast, or scorch.
- trace fossil — a fossilized track, trail, burrow, boring, or other structure in sedimentary rock that records the presence or behavior of the organism that made it.
- traffic cone — conical road markers
- traffic duty — an assignment to help the flow of traffic and enforce traffic regulations
- traffic sign — notice to vehicles
- transfection — the insertion into a cell of a bacterial plasmid that contains a foreign virus or genetic material.
- transfermium — having an atomic number greater than 100, the atomic number of fermium.
- transferring — to convey or remove from one place, person, etc., to another: He transferred the package from one hand to the other.
- transforming — to change in form, appearance, or structure; metamorphose.
- transformism — the doctrine of gradual transformation of one species into another by descent with modification through many generations.
- transformist — an adherent of transformism.
- transmogrify — to change in appearance or form, especially strangely or grotesquely; transform.
- transpacific — passing or extending across the Pacific.
- trefoil arch — an arch with cusplike intrados.
- trifoliolate — having three leaflets, as a compound leaf.
- trifurcation — to divide into three forks or branches.
- trinacriform — three-pronged
- trustafarian — a young person from a wealthy background whose trust fund enables him or her to eschew conventional attitudes to work, dress, drug taking, etc
- trypaflavine — acriflavine hydrochloride.
- tubulifloral — (of a plant) tubuliflorous
- turf dancing — a fluid style of street-dancing originating in the Bay Area of San Francisco, California
- ultraleftist — ultraleft.
- ultrarefined — having been refined exceptionally well or thoroughly
- unaffrighted — to frighten.
- unartificial — not showing art or skill; not skilled or artistic
- unfabricated — to make by art or skill and labor; construct: The finest craftspeople fabricated this clock.
- unfilterable — not able to be filtered
- unflattering — to try to please by complimentary remarks or attention.
- unforgivable — to grant pardon for or remission of (an offense, debt, etc.); absolve.
- unforgivably — in an unforgivable manner
- unformalized — not formalized
- unformidable — causing fear, apprehension, or dread: a formidable opponent.
- unfranchised — a privilege of a public nature conferred on an individual, group, or company by a government: a franchise to operate a bus system.
- unifactorial — of or relating to a single gene.
- unprofitable — being without profit; not showing or turning a profit: a series of unprofitable ventures.
- unstratified — not stratified; not arranged in strata or layers: unstratified rocks.
- unverifiable — to prove the truth of, as by evidence or testimony; confirm; substantiate: Events verified his prediction.
- valve lifter — (in an internal-combustion engine) a tappet that opens a valve when actuated by a camshaft.
- variant form — a way of writing a word which is used by some people as an alternative to the standard or generally accepted form
- verification — the act of verifying.
- vicar forane — dean1 (def 2b).
- vitrifacture — the making of glass or glass products
- vociferation — noisy outcry; clamor.
- walking fern — a fern, Camptosorus rhizophyllus, having simple, triangular fronds tapering into a prolongation that bends at the top and often takes root at the apex.
- water filter — device for removing impurities from water
- waterfalling — Present participle of waterfall.