All articles starting with M
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Megadeth
Megadeth is an American thrash metal band formed in Los Angeles in 1983 by Dave Mustaine after his dismissal from Metallica, one of the "Big Four" of thrash.
Megadeth (album)
Megadeth is the 17th and final studio album by Megadeth, released January 23, 2026 on Tradecraft/BLKIIBLK. It reached No. 1 on the Billboard 200 and ARIA charts and includes the bonus cover "Ride the Lightning".
Megadeth discography
Megadeth discography: 17 studio albums (1985–2026) by Dave Mustaine's thrash metal band, from Killing Is My Business (Combat, 1985) through Rust in Peace, Countdown to Extinction, and the final self-titled Megadeth (2026), the band's first Billboard 200 No. 1.
Megadimension Neptunia VII (新次元ゲイム ネプテューヌVII)
Megadimension Neptunia VII (新次元ゲイム ネプテューヌVII, pronounced V-II) is Compile Heart and Idea Factory's fourth mainline Neptunia JRPG, the first on PS4, released in Japan April 23, 2015, with three story arcs, NEXT mode, and a Metacritic score of 71.
Megadiverse countries
Megadiverse countries: 17 nations (Brazil, Colombia, Indonesia, Mexico, Australia, and others) identified by Conservation International as holding about 70% of Earth's biodiversity, defined by at least 5,000 endemic plants and marine ecosystems.
Megadoc
Megadoc (2025) is Mike Figgis's fly-on-the-wall documentary about Francis Ford Coppola making his $120 million self-financed epic Megalopolis, from Atlanta production through its Cannes premiere; screened at Venice 2025 and released by Utopia.
Megafauna
Megafauna: large animals, typically over 44 kg adult body weight, spanning terrestrial, freshwater, and marine species. Known for late Quaternary extinctions over the last 50,000 years and debated human versus climate causes.
Megaforce
Megaforce is a 1982 American action science fiction film directed by Hal Needham, starring Barry Bostwick, about an elite military unit that intervenes when governments will not.
Megakaryocyte
A megakaryocyte is a large bone marrow cell that produces blood platelets by fragmenting its cytoplasm. It is the largest hematopoietic cell in the bone marrow.
Megakaryocyte progenitor cell
Megakaryocyte progenitor cell (CFU-MK, BFU-MK, MkP): hematopoietic progenitor committed to megakaryocytes and platelet production; TPO-regulated, CD41/CD61-marked, with direct HSC-derived routes and clinical trial use.
Megaklothovirus horridgei
Megaklothovirus horridgei is a putative giant virus infecting the arrow worm Spadella cephaloptera, described in 2019 after structures in decades-old micrographs were mistaken for bristles and bacteria.
MEGAL Gas Pipeline
The MEGAL is a German long-distance natural gas pipeline system running from the Czech border at Waidhaus to the French border, built between 1975 and 1981.
Megalania
Megalania (Varanus priscus, formerly Megalania prisca) was an extinct giant Australian Pleistocene monitor lizard, the largest land lizard known, up to 5–6 m and about 300 kg, a predatory scavenger that died out around 50,000 years ago.
Megalastrum
Megalastrum Holttum is a genus of terrestrial ferns in Dryopteridaceae, segregated from Ctenitis and allied to Lastreopsis and Rumohra. Native from Mexico to southern South America with Old World outliers; about 30 to 90 species depending on treatment.
Megalencephalic leukoencephalopathy with subcortical cysts
Megalencephalic leukoencephalopathy with subcortical cysts (MLC, Van der Knaap disease) is a rare leukodystrophy with infantile macrocephaly, swollen white matter, anterior temporal cysts, and genes MLC1, GLIALCAM, GPRC5B, AQP4.
Megalencephaly-capillary malformation-polymicrogyria syndrome
Megalencephaly-capillary malformation-polymicrogyria syndrome (MCAP, M-CM, OMIM 602501) is a rare PIK3CA-mosaic overgrowth disorder with megalencephaly, polymicrogyria, and cutaneous capillary malformations, sporadic, present at birth.
Megalencephaly-polymicrogyria-postaxial polydactyly-hydrocephalus syndrome
MPPH syndrome, also called megalencephaly-polymicrogyria-polydactyly-hydrocephalus syndrome, is a rare autosomal dominant brain overgrowth disorder caused by AKT3, CCND2, or PIK3R2 gain-of-function variants in the PI3K-AKT-mTOR pathway, with polymicrogyria, hydrocephalus, and postaxial polydactyly.
Megali Idea (Μεγάλη Ιδέα)
Megali Idea (Μεγάλη Ιδέα, Great Idea), Greek irredentist doctrine coined by Ioannis Kolettis on 14 January 1844, aiming to unite all Greek territories under a Byzantine-model state with Constantinople as capital; abandoned after the 1922 defeat.
Megali Magoula
Megali Magoula (Μεγάλη Μαγούλα), Bronze Age hill site near Galatas, Troizinia, Greece: fortified Middle Helladic settlement with three Mycenaean tholos tombs, excavated 1995-2000 by E. Konsolaki-Yannopoulou; Tomb 3 is the earliest tholos in the northeastern Peloponnese.
Megalith
Megalith: a very large stone used in prehistoric monuments such as menhirs, dolmens, and cromlechs; earliest European centers in northwest France (47th century BC); transport by rollers now doubted, glacial transport of Stonehenge bluestones refuted.
Megalith Ventures
Megalith Ventures is a venture capital fund manager based in Tiburon, California, led by John Komkov, which raised two funds totaling about $211.55 million between 2021 and 2025.
Megalithic Temples of Malta
Prehistoric monumental temple complexes on Malta and Gozo (Ġgantija, Ħaġar Qim, Mnajdra, Skorba, Ta' Ħaġrat, Tarxien), built in the 4th–3rd millennia BC, among the world's earliest free-standing stone buildings, UNESCO-listed since 1980.
Megaliths of Carnac and of the shores of Morbihan
Megaliths of Carnac and of the shores of Morbihan (Mégalithes de Carnac et des rives du Morbihan): serial UNESCO World Heritage site in Brittany, France, inscribed 12 July 2025, dense Neolithic megalithic monuments built c. 5000–2300 BCE.
Megaloappendix
Megaloappendix (ICD-11 DB11.0) is an abnormally long, enlarged vermiform appendix; the largest removed measured 55 cm in a 2011 Qatari case report, versus a 6–9 cm normal average.
Megaloblastic anaemia due to vitamin B12 deficiency
Megaloblastic anaemia due to vitamin B12 deficiency (ICD-11 3A01), also called cobalamin deficiency anaemia or Addison anaemia: impaired DNA synthesis from low B12 causes macrocytic anaemia, elevated MMA and homocysteine, and neurological damage; pernicious anaemia is the leading cause.
Megaloblastic anemia
Megaloblastic anemia, a macrocytic anemia from defective DNA synthesis, usually caused by vitamin B12 or folate deficiency; pernicious anemia is the leading B12 cause, with macro-ovalocytes and hypersegmented neutrophils on smear.
Megaloceros
Megaloceros giganteus, the giant deer or Irish elk, a huge Pleistocene Eurasian deer with antlers up to 3.5 m, closest living relative the fallow deer, extinct about 8,000 years ago.
Megalocornea-intellectual disability syndrome
Megalocornea-intellectual disability syndrome, also called MMR or Neuhäuser syndrome (OMIM 249310), is an extremely rare autosomal recessive disorder combining enlarged corneas without glaucoma, hypotonia, intellectual disability, seizures, and facial dysmorphism, with about 40 reported cases and unknown genetic cause.
Megalocytivirus pagrus1
Megalocytivirus pagrus1 is an iridovirus that infects more than 100 marine and freshwater fish species, first recorded in farmed red sea bream in Japan in 1990.
Megalodon
Megalodon (Otodus megalodon, formerly Carcharocles megalodon), extinct giant shark of 23 to 3.6 million years ago, largest shark ever, known mainly from 18 cm teeth; estimates up to 24.3 m; not alive today.