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Fagales
Fagales (Engler, 1892) is an order of woody flowering plants in the fabid rosids, with seven families including Betulaceae, Fagaceae, Juglandaceae, Nothofagaceae, Casuarinaceae, Myricaceae, and Ticodendraceae; about 1,325 species, wind-pollinated, Cretaceous origin, NCBI taxonomy ID 3502.
Fagopyrum
Fagopyrum (buckwheat genus), Polygonaceae, ca. 25-30 species mostly from southern China and the Himalaya; includes cultivated common buckwheat F. esculentum and Tartary buckwheat F. tataricum, split into cymosum and urophyllum groups.
Fagopyrum tataricum
Fagopyrum tataricum, Tartary or bitter buckwheat (तिते फापर), is a self-pollinating Himalayan pseudocereal grown by the Yi people since the 2nd century BC, distinguished from common buckwheat by rutin levels up to 81 mg/g and bitter grain.
Fagus
Fagus (beech) is a genus of about 10–15 deciduous Fagaceae trees of the temperate Northern Hemisphere, from Europe, Asia, and North America to Mexico, with trigonous nuts and a fossil record back to the early Paleocene/Eocene.
Fagus crenata
Fagus crenata, the Japanese beech, is a deciduous beech-family tree endemic to Japan, growing 15 to 30 meters tall and dominating cool-temperate forests from Kyushu to Hokkaido.
Fagus grandifolia
Fagus grandifolia (American beech), the only North American Fagus, a slow-growing shade-tolerant deciduous tree of eastern North America, 20-30 m, living 300-400 years, threatened chiefly by beech bark disease.
Fagus orientalis
Fagus orientalis, the Oriental beech, is a large deciduous tree of the beech family Fagaceae, native from southeastern Bulgaria across Türkiye to the Caucasus and the Hyrcanian forests of Iran.
Fagus sylvatica
Fagus sylvatica, European beech, is a large deciduous Fagaceae tree native from southern Scandinavia to Sicily and Spain to northwest Turkey, dominating Central European natural forests, with mast fruiting every 5–8 years and around 250 wood usages.
Faidherbia albida
Faidherbia albida (apple-ring acacia, winter thorn; formerly Acacia albida) is the sole species of its genus, a dryland African leguminous tree with reverse leaf phenology, leafless in the rains, widely used in agroforestry to raise crop yields and soil fertility.
Failed attempted abortion
Failed attempted abortion (ICD-10 O07; ICD-11 JA00.3; French: Echec d'une tentative d'avortement) is a classification category for an abortion attempt that fails, leaving ongoing pregnancy or retained products, with complication-based subdivisions.
Failed induction of labour
Failed induction of labour (ICD-11 JB01) is an unsuccessful attempt to stimulate contractions before spontaneous labour. No accepted definition exists; a 2025 review found 112 definitions in 96 studies, with cervical status the main predictor.
Failed or difficult intubation
Failed or difficult intubation: inability to place a tracheal tube, or needing multiple attempts (difficult airway, CICO). Predictors include prior difficult intubation, Mallampati 3-4, short thyromental distance; managed by DAS/ASA algorithms.
Failure to thrive
Failure to thrive (FTT), now termed faltering weight or faltering growth, is subnormal weight gain in infancy or childhood; affects about 5-10% of primary care children, usually multifactorial, renamed by the 2026 AAP/NASPGHAN guideline.
Failure to thrive in newborn
Failure to thrive in newborn (ICD-11 KD32.4), now called growth faltering or faltering weight, is slower than expected newborn weight gain, usually from inadequate caloric intake; defined by z-score cutoffs and treated with calorie-dense feeding.
Fainting goat
Fainting goat, or Myotonic goat (Tennessee Fainting, Wooden Leg, Stiff-leg goat), an American meat goat breed from 1880s Tennessee whose myotonia congenita, a CLCN1 chloride-channel mutation, makes muscles stiffen when startled; now Recovering on the Livestock Conservancy list.
FAIRE-seq
FAIRE-seq is a genomics method that maps open chromatin across the genome by combining formaldehyde crosslinking, sonication, and phenol-chloroform extraction with high-throughput sequencing, typically recovering 1–3% of the human genome.
Fairy ring
Fairy ring, also called fairy circle or elf ring, is a ring or arc of mushrooms or altered grass caused by radially growing soil fungi such as Marasmius oreades, producing green, dead, or mushroom-only rings through nitrogen release and soil hydrophobicity.
Fairyfly
Fairyfly (Mymaridae), also called fairy wasp: a family of minute chalcidoid parasitoid wasps that lay eggs inside other insects' eggs. Includes the smallest known insect, Dicopomorpha echmepterygis at 0.139 mm, and bristled-wing flight at Reynolds numbers of 4 to 60.
Faith McLellan
Faith McLellan is a medical humanities scholar and medical editor who studied patients' online illness narratives and later became North American Senior Editor of The Lancet.
Faith Osier
Faith Osier is a Kenyan immunologist and pediatrician who studies which antibodies protect against malaria to design blood-stage vaccines, and chairs Immunology at Imperial College London.
Faizan Zaki (ఫైజాన్ జాకీ)
Faizan Zaki (ఫైజాన్ జాకీ), 13-year-old from Allen, Texas, won the 2025 Scripps National Spelling Bee with "éclaircissement" after finishing second in 2024 to Bruhat Soma.
Faı̈ez Zannad
Faıëz Zannad, also written Faiez Zannad, is a French cardiologist and clinical trialist at the University of Lorraine who chaired the EMPHASIS-HF and EMPEROR-Reduced heart failure trials.
Falcaria vulgaris
Falcaria vulgaris (sickleweed, longleaf) is a glaucous Apiaceae herb native from Central Europe and the Mediterranean to Central Asia, introduced and invasive in North American rangelands, with traditional medicinal uses.
Falcataria
Falcataria is a genus of three fast-growing, nitrogen-fixing legume trees native from eastern Malesia to the Santa Cruz Islands. Its best-known species, Falcataria falcata (formerly F. moluccana, albizia, batai), is planted for timber and shade but invades Pacific forests.
Falcataria moluccana
Falcataria moluccana, also called Falcataria falcata, Moluccan albizia, batai, or sengon, is a fast-growing nitrogen-fixing Fabaceae tree native to the Moluccas, New Guinea, and Solomon Islands, widely planted for timber yet invasive in Hawaii.
Falcipains
Falcipains are four papain-fold cysteine proteases (FP1, FP2, FP2′, and FP3) encoded by the malaria parasite Plasmodium falciparum, which degrade host hemoglobin and have been pursued as antimalarial drug targets for three decades.
Falco mexicanus
Falco mexicanus, the prairie falcon (Halcón mexicano), is a large light-brown falcon of western North America's arid grasslands and deserts, nesting on cliffs, hunting ground squirrels in low fast flight, and ranked G5/Least Concern.
Falco naumanni
Falco naumanni, the lesser kestrel (Cernícalo primilla), is a small colonial Palearctic falcon, authority Fleischer 1818, that eats insects in cereal fields, winters in sub-Saharan Africa, and is IUCN Least Concern globally with 80,000-134,000 mature individuals.
Falco subbuteo
Falco subbuteo, the Eurasian hobby, is a small Palearctic falcon hunting insects and birds in flight, migrating to Africa; IUCN Least Concern, 900,000–1,500,000 mature individuals, namesake of the Subbuteo game.
Falco subniger
Falco subniger, the Black Falcon (Wandhala in Gamilaraay), is a large sooty-black Australian falcon of the subgenus Hierofalco, closest to the Laggar Falcon. It hunts birds by stooping and piracy, nests in appropriated raven and raptor stick nests, and is listed Vulnerable in NSW and Critically Endangered in Victoria.