12-letter words containing a, f, i, r, m
- placentiform — shaped like a placenta, with a flat rounded form
- preamplifier — a device in the amplifier circuit of a radio or phonograph that increases the strength of a weak signal for detection and further amplification.
- preformation — previous formation.
- preformative — a prefixture in Semitic languages
- prime factor — any number in the set of prime numbers that is also a factor of a given integer
- rachmaninoff — Sergei Wassilievitch [sur-gey vuh-seel-yuh-vich;; Russian syir-gyey vuh-syee-lyi-vyich] /sɜrˈgeɪ vəˈsil yə vɪtʃ;; Russian syɪrˈgyeɪ vʌˈsyi lyɪ vyɪtʃ/ (Show IPA), 1873–1943, Russian pianist and composer.
- ramification — the act or process of ramifying.
- reformatting — the shape and size of a book as determined by the number of times the original sheet has been folded to form the leaves. Compare duodecimo, folio (def 2), octavo, quarto.
- royal family — the immediate family of a reigning monarch.
- stalactiform — resembling or shaped like a stalactite.
- steam fitter — a person who installs and repairs steampipes and their accessories.
- stratiformis — occurring in a very extensive horizontal layer.
- surface mail — the system, especially a government postal system, of sending mail by truck, train, or boat, as opposed to airmail.
- tank farming — hydroponics.
- terraforming — to alter the environment of (a celestial body) in order to make capable of supporting terrestrial life forms.
- transfermium — having an atomic number greater than 100, the atomic number of fermium.
- 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.
- trinacriform — three-pronged
- unformalized — not formalized
- unformidable — causing fear, apprehension, or dread: a formidable opponent.
- variant form — a way of writing a word which is used by some people as an alternative to the standard or generally accepted form
- window frame — structure surrounding a window pane
- wing formula — a numerical representation of the relative lengths of the primary feathers of a bird's wing, used in identifying similar species, as flycatchers.
- woman friend — a female friend
- zimmer frame — A Zimmer frame or a Zimmer is a frame that old or ill people sometimes use to help them walk.