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Anti-materiel rifle
An anti-materiel rifle (AMR), also called an anti-materiel sniper rifle, is a rifle designed to destroy military equipment rather than personnel, firing .50 caliber rounds and larger.
Anti-merchant edicts of Gaozu
The anti-merchant edicts of Gaozu (抑商诏令) were decrees issued by Emperor Gaozu of Han after founding the dynasty, barring merchants from silk, carriages, and office and taxing them heavily.
Anti-miscegenation laws
Anti-miscegenation laws were US state statutes banning interracial marriage, from colonial Virginia's 1662 act and Maryland's 1664 law until Loving v. Virginia struck down the remaining bans on June 12, 1967; the Respect for Marriage Act of 2022 added federal recognition.
Anti-miscegenation laws in the United States
Anti-miscegenation laws in the United States were state statutes banning interracial marriage, in force from the colonial era until Loving v. Virginia struck them down in 1967.
Anti-Monitor
Anti-Monitor, also known as Mobius, is a cosmic supervillain from DC Comics. Born in the Antimatter Universe, he destroyed the Multiverse during Crisis on Infinite Earths (1985).
Anti-Müllerian hormone
Anti-Müllerian hormone (AMH), also called Müllerian inhibiting substance, is a hormone that regresses the Müllerian ducts in male fetuses; in females its blood level measures ovarian reserve.
Anti-neutrophil cytoplasmic antibody
Anti-neutrophil cytoplasmic antibodies (ANCA), autoantibodies against neutrophil proteinase 3 and myeloperoxidase, are diagnostic markers for ANCA-associated vasculitis, detected by immunofluorescence (cANCA, pANCA) and antigen-specific immunoassays.
Anti-nihilist novel
The anti-nihilist novel (антинигилистический роман) is a conventional name for Russian socio-political novels of the 1860s to early 1880s portraying nihilists as a threat to Russian life.
Anti-NMDA receptor encephalitis
Anti-NMDA receptor encephalitis (anti-NMDAR encephalitis) is the most common autoimmune encephalitis, caused by IgG antibodies against the GluN1/NR1 NMDA receptor subunit, often triggered by ovarian teratoma, diagnosed by CSF antibodies, and treated with immunotherapy and tumor removal.
Anti-nuclear antibody negative
Anti-nuclear antibody negative (ICD-11 MA14.13, ANA-) is a lab finding of no antinuclear antibodies detected. It lowers the likelihood of autoimmune disease but never rules it out; ENA antibodies occur in about 8% of ANA-IIF-negative suspected CTD cases.
Anti-nuclear antibody positive
Anti-nuclear antibody positive: a screening result showing serum autoantibodies to nuclear antigens, detected by HEp-2 immunofluorescence or solid-phase assay; common in healthy people, interpreted by titer, pattern, and clinical context.
Anti-obesity medication
Anti-obesity medications are drugs for chronic weight management in adults with BMI ≥30 or ≥27 with complications, ranging from orlistat and phentermine-topiramate to GLP-1 drugs semaglutide, tirzepatide, and orforglipron.
Anti-Oedipus
Anti-Oedipus (L'Anti-Œdipe), 1972 book by Gilles Deleuze and Félix Guattari, first volume of Capitalism and Schizophrenia; rejects the Oedipus complex, proposes schizoanalysis, links desire to capitalism; English translation 1977.
Anti-p200 pemphigoid
Anti-p200 pemphigoid (anti-laminin γ1 pemphigoid) is a rare subepidermal autoimmune blistering disease first described in 1996, targeting a 200-kDa dermal protein, with acral blisters, n-serrated immunofluorescence, and BP-like treatment.
Anti-parity-time symmetry in optics
Anti-parity-time (anti-PT or APT) symmetry in optics is a non-Hermitian symmetry where an optical Hamiltonian anticommutes with the parity-time operator, yielding imaginary spectra and gain-free designs.
Anti-Party Group
Anti-Party Group: Soviet Presidium coalition of Malenkov, Molotov, and Kaganovich that tried to oust Khrushchev in June 1957; also the 1959 Chinese label for the Peng Dehuai faction condemned at Lushan.
Anti-pattern
An anti-pattern is a recurring software solution that looks like a good idea when adopted but leads into trouble; Andrew Koenig coined the term in 1995.
Anti-PD-1 therapy
Anti-PD-1 therapy is a cancer immunotherapy that uses monoclonal antibodies such as pembrolizumab and nivolumab to block the PD-1 checkpoint on T cells, first approved in 2014 for melanoma.
Anti-PD-L1 therapy
Anti-PD-L1 therapy is a cancer immunotherapy using antibodies such as atezolizumab, durvalumab, and avelumab that block the PD-L1 protein, restoring immune attack on lung, bladder, liver, and skin cancers.
Anti-PEG immunity
Anti-PEG immunity is the immune response of antibodies that recognize polyethylene glycol (PEG) on drugs and nanocarriers, reducing efficacy or causing hypersensitivity reactions, including occasionally fatal anaphylaxis.
Anti-perovskite lithium-ion conductors
Anti-perovskite lithium-ion conductors are lithium-rich solid electrolytes with a perovskite-inverted structure, typified by Li₃OCl, valued for high ionic conductivity, stability against lithium metal, and use in all-solid-state batteries.
Anti-perovskite solid electrolyte
An anti-perovskite solid electrolyte is a crystalline ionic conductor, built mainly from lithium, oxygen, and chlorine or bromine, in which ions occupy inverted perovskite lattice positions; the prototype is Li₃OCl.
Anti-personnel mine
An anti-personnel mine is a victim-activated explosive munition buried or camouflaged on the ground that explodes from a person's presence, proximity, or contact, harming civilians long after conflicts end.
Anti-Polish sentiment
Anti-Polish sentiment: hostility toward Poles as a national group, also called Polonophobia. Covers Prussian Germanization, Nazi propaganda from 1939, Polish American stereotyping, and racialisation of Polish migrants in Brexit-era Britain.
Anti-predator adaptation
Anti-predator adaptation: traits and behaviors reducing predation risk, from primary defenses (crypsis, masquerade, aposematism, Batesian mimicry, hiding) to secondary defenses (flight, thanatosis, autotomy, venom metering), documented especially in spiders.
Anti-predator adaptations in gastropods
Anti-predator adaptations in gastropods are the defenses snails and sea slugs use against predators that crush, drill, or swallow them: shells, toxins, escape behavior, and camouflage.
Anti-predator defense in spiders
Anti-predator defense in spiders is mainly behavioral: hiding and camouflage as primary defenses, then dropping on silk lines, threat displays, and feigning death once a predator attacks.
Anti-proliferative protein
Anti-proliferative protein denotes the BTG/Tob (APRO) family of six mammalian cell-cycle inhibitors (BTG1-4, TOB1, TOB2), defined by a conserved N-terminal BTG domain that binds the CNOT7/CNOT8 deadenylase subunits of Ccr4-Not, repressing proliferation and acting as tumor suppressors.
Anti-psychiatry
Anti-psychiatry: international movement of the 1960s, led by R.D. Laing, David Cooper (who coined the term), and Thomas Szasz, rejecting psychiatry's medical model and institutional power; distinct from critical psychiatry and the psychiatric survivors movement.
Anti-PT symmetry
Anti-PT symmetry, also called anti-parity-time symmetry, is a non-Hermitian symmetry where the Hamiltonian anticommutes with the parity-time operator, first demonstrated optically in 2018's precursor experiments of 2016 in rubidium vapor.