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/fəˈnestrə/ Noun, pl. fenestras or fenestrae 1. A term is used to refer to a natural (as opposed to traumatic) opening in the skull or other bones. ( 2. An opening in a body, sometimes with a membrane. ( 3. A small natural hole or opening, esp. in a bone. The mammalian middle ear is linked by the fenestra ovalis to the vestibule of the inner ear, and by the fenestra rotunda to the cochlea. (Google Dictionary) 4. An artificial opening. (Google Dictionary) 5. A perforation in a forceps blade. (Google Dictionary) 6. A hole made by surgical fenestration. (Google Dictionary) Word origin: A Latin word that means...

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/ˈfētəs/ Noun, pl. fetuses 1. A developing mammal or other viviparous vertebrate after the embryonic stage and before birth. In humans, the fetal stage of prenatal development starts at the beginning of the 11th week in gestational age, which is the 9th week after fertilization. ( 2. A developing unborn offspring of an animal that gives birth to its young (as opposed to laying eggs). ( 3. An unborn or unhatched vertebrate showing signs of the mature animal. ( 4. A human embryo after the 8th week of gestation. ( 5. An unborn or unhatched vertebrate in the later stages of development showing the main recognizable features of the mature animal. ( Word origin: From Latin fetus (often, incorrectly, foetus) “the bearing, bringing forth, or hatching of young,” from Latin base *fe- “to generate, bear,” also “to suck,...

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/ˈfībrəl/ Noun, pl. fibrils 1. A fine fiber, such as a myofibril or neurofibril. ( 2. A fine fibre or filament. ( 3. (Biology) Any fine, filamentous structure in animals or plants. ( 4. A small or slender fiber. (Google Dictionary) 5. The diminuitive of fibre. A small fibre, a fine thread. ( Word origin: 1680s, back-formation from Modern Latin fibrilla, diminutive of Latin...

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/ˈfibyələ/ Noun, pl. fibulae, fibulas 1. A leg bone located on the lateral side of the tibia, with which it is connected above and below. It is the smaller of the two bones, and, in proportion to its length, the slenderest of all the long bones. ( 2. The smaller of the two bones in the lower leg, the calf bone. ( 3. The outer and thinner of the two bones of the human leg between the knee and ankle. ( 4. A long bone in the lower leg that is adjacent to the tibia. The fibula supports approximately 1/6th of the body weight and produces the lateral (outer) prominence of the ankle. The outer and thinner of the two bones of the human leg between the knee and ankle.A bone found in the legs of tetrapods that lie adjacent to the tibia. ( Syn: calf bone Word origin: From Latin fībula (“clasp,...

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/filˈtrāSHən/ Noun, pl. filtrations 1. Commonly the mechanical or physical operation which is used for the separation of solids from fluids (liquids or gases) by interposing a medium through which only the fluid can pass. Oversize solids in the fluid are retained, but the separation is not complete; solids will be contaminated with some fluid and filtrate will contain fine particles (depending on the pore size and filter thickness). Filtration is also used to describe some biological processes, especially in water treatment and sewage treatment in which undesirable constituents are removed by absorption into a biological film grown on or in the filter medium as in slow sand filtration. ( 2. The act or process of filtering; the mechanical separation of a liquid from the undissolved particles floating in it. ( 3. The movement of water and solutes across the cell membrane due to hydrostatic pressure from the cardiovascular system. ( 4. The process of separating suspended particles from the fluid through a porous material in which the fluid can pass while the suspended particles are retained. ( 5. The process whereby fluids pass through a filter or a filtering medium. ( Word origin: From Medieval Latin filtrum “felt,” which was used to strain impurities from...

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