12-letter words containing s, i, r, o
- fiber optics — the branch of optics that deals with the transmission of light through transparent fibers, as in the form of pulses for the transmission of data or communications, or through fiber bundles for the transmission of images.
- fibre optics — optical fibre
- fibrinolysin — a proteolytic enzyme, formed in the blood from plasminogen, that causes the breakdown of the fibrin in blood clots.
- fibrinolysis — the disintegration or dissolution of fibrin, especially by enzymatic action.
- fibroblastic — a cell that contributes to the formation of connective tissue fibers.
- fibromatosis — (pathology) The presence of multiple fibromas.
- fibrosarcoma — a sarcoma derived from fibroblast cells, often able to generate collagen.
- fibrous root — a root, as in most grasses, having numerous, very fine branches of approximately the same length.
- fidel castro — Cipriano [sip-ree-ah-noh;; Spanish see-pree-ah-naw] /ˌsɪp riˈɑ noʊ;; Spanish ˌsi priˈɑ nɔ/ (Show IPA), 1858?–1924, Venezuelan military and political leader: president 1901–08; exiled 1908.
- field sports — sports carried on in the open countryside, such as hunting, shooting, or fishing
- fingerboards — Plural form of fingerboard.
- fire station — a building in which firefighting apparatus and usually fire department personnel are housed; firehouse.
- fire support — support given by artillery and aircraft to infantry and armored vehicles.
- first cousin — cousin (def 1).
- first nation — any of the indigenous peoples or Indian communities of Canada, especially one formally recognized by the Canadian government.
- first of all — to start with
- first person — the grammatical person used by a speaker in statements referring to himself or herself (first person singular) or to a group including himself or herself (first person plural)
- first school — A first school is a school for children aged between five and eight or nine.
- first violin — one of the principal group of violins in an orchestra
- fish factory — a factory where fish is processed
- fisherpeople — Plural form of fisherperson.
- fisherperson — A fisherman or fisherwoman.
- fishing port — a town which has a lot of fishing boats
- fishing worm — an earthworm.
- fishmonger's — a shop that sells fish
- fissirostral — having a broad, deeply cleft beak or bill, as the swallows and goatsuckers.
- fitness room — a room with gym equipment in it
- flammiferous — flame-producing
- fleet prison — (formerly) a London prison, esp used for holding debtors
- flickermouse — Alternative form of flittermouse.
- flindermouse — (obsolete) A bat (the mammal).
- flittermouse — bat2 (def 1).
- floor polish — a substance used to polish floors
- flooring saw — a saw having a curved edge.
- florida keys — chain of small islands extending southwest from the S tip of Fla.
- florida moss — Spanish moss.
- flour sifter — a container in which flour is sifted
- flourishment — The act or state of flourishing.
- fluoresceine — Alternative spelling of fluorescein.
- fluorimeters — Plural form of fluorimeter.
- fluoroscopic — of or relating to the fluoroscope or fluoroscopy.
- flusteration — (colloquial, dated) The act of flustering, or the state of being flustered.
- folkloristic — the traditional beliefs, legends, customs, etc., of a people; lore of a people.
- followership — the ability or willingness to follow a leader.
- food service — the preparation, delivery, serving, etc., of ready-to-eat foods: The cafeteria employs over 20 people in food service.
- foolhardiest — Superlative form of foolhardy.
- foot soldier — an infantryman.
- footsoldiers — Plural form of footsoldier.
- for instance — a case or occurrence of anything: fresh instances of oppression.
- for-instance — an instance or example: Give me a for-instance of what you mean.