#science

• Azonal — Not distributed in regular geographic or climatic zones; refers especially to soils (azonal soils) or vegetation formations whose occurrence, evolution, and spatial distribution are exclusively determined by local geological, hydrological, or topographic conditions (such as river alluvium), independent of the macroclimate of that respective latitudinal zone.
• Azoo — Completely devoid of animal organisms or traces of faunal existence; a term utilized as an independent adjective or combining form (a variant of azoic) to describe sterile ecological environments, archaic geological strata, or laboratory cultures where no animal life forms have developed.
• Nitrate — A salt or ester of nitric acid containing the NO3 functional group; in common and agricultural language (often called nitrate), it refers to chemical fertilizers used for enriching the soil with nitrogen, whose excessive use can lead to the pollution of groundwater.
• Nitrosyl — A monovalent chemical radical consisting of a nitrogen atom bonded to an oxygen atom (-NO), known in modern nomenclature as the nitrosyl radical; it represents an active functional group in the synthesis of organo-nitrogen compounds and in the study of redox reactions.
• Nitrous acid — A systematic name rarely used to designate nitrous acid (HNO2) in correlation with its salts; also, a term applied in old records to the hydrated forms or unstable aqueous solutions of lower-valence nitrogen oxides.
• Azotobacter — A genus of aerobic, motile, oval or spherical bacteria that live freely in the soil and possess the remarkable capacity to fix molecular atmospheric nitrogen directly into organic compounds assimilable by plants, without establishing a symbiotic relationship with their roots; it is widely used in bio-agriculture as a biofertilizer to stimulate soil fertility.
• Azotobacterial — Pertaining to the bacterium genus Azotobacter, belonging to it, or produced by the metabolic activity of these microorganisms; often used to describe biological preparations, laboratory cultures, or non-symbiotic nitrogen-fixing processes in the soil.
• Azotobacter bacterium — A generic name utilized in technical or regional speech for any bacterium belonging to the Azotobacter genus; an aerobic microorganism capable of non-symbiotic fixation of molecular nitrogen directly from the air within the upper soil layers.
• Azotometer — A laboratory apparatus or precision instrument used for the quantitative determination of the volume of nitrogen released during a chemical reaction or organic decomposition process. This structural device, typically made of borosilicate glass and equipped with a graduated scale, is essential in volumetric elemental analyses for measuring the purity of gaseous compounds.
• Azide — A binary chemical compound formed by the combination of nitrogen with a more electropositive element, usually a metal or a specific non-metal. Depending on the bond structure, they can be ionic, covalent, or interstitial, being characterized by high thermal stability for some metals or pronounced explosive properties, such as heavy metal azides used as detonators.
• Azulene — A bicyclic aromatic hydrocarbon, an isomer of naphthalene, structurally characterized by an intense blue color and a specific aromatic odor. This organic substance occurs naturally in the essential oils of certain medicinal plants, such as chamomile or yarrow, and is recognized and widely used for its anti-inflammatory, antiseptic, and soothing properties in the cosmetic and pharmaceutical industries.
• Azures — A secondary plural form of the noun azure or a poetic substantivization designating multiple shades, reflections, or vast expanses of sky and marine blue. In high literary style, the term evokes the chromatic diversity and luminosity of atmospheric layers observed at different times of the day.
• Babbage — A proper name of English origin, globally renowned due to Charles Babbage (1791–1871), a British mathematician, philosopher, and mechanical engineer, widely considered the father of computing for designing the first programmable mechanical computers: the Difference Engine and the Analytical Engine. The term is used symbolically or academically as a foundational historical reference for the origins of modern computer architecture.
• Babelon — A proper name of French origin, renowned due to illustrious scholars such as Ernest Babelon (1854–1924), a famous numismatist and archaeologist, specialist in antiquity, or his son Jean Babelon, also a historian; the term serves as an academic eponym in the study of ancient coins and glyptics.
• Bachelard — A French surname globally celebrated in academic circles due to Gaston Bachelard, an influential 20th-century philosopher, epistemologist, and literary critic. His structural body of work revolutionized the philosophy of science by introducing the concept of the 'epistemological obstacle' and deeply analyzed the poetic imagination through the lens of nature's primordial elements, heavily influencing structuralism and poststructuralism.
• Bachelite — A rare mineral or a structural petrographic variety described in old geological reference works, sometimes used as a spelling variant for industrial bakelite or as a regional name for a certain type of compact sedimentary rock. In contemporary vocabulary, it is monitored to prevent confusion with bakelite (the plastic material), representing a strictly technical term within a narrow geological niche.
• Bakelite — A synthetic resin derived from the condensation of formaldehyde with phenol in the presence of an acid or alkaline catalyst, famously recognized as the world's first fully synthetic plastic material. This thermosetting polymer possesses excellent electrical insulation properties and high heat resistance, being extensively utilized in manufacturing appliance casings, insulators, industrial parts, and vintage design objects.
• Background — A polysemous term borrowed from English, denoting: 1. In computer science, the screen wallpaper or secondary software processes hidden from the user. 2. In visual arts and photography, the backdrop or secondary plane of a composition. 3. In sociology and management, the collective knowledge, education, professional experience, or socio-cultural context of a person's past that shapes their current development.
• Backshore — The part of the beach lying between the berm crest and the coastline, cliff, or sand dunes, located above the mean high-water line of normal tides. This structural sector is submerged exclusively during exceptional storms or extraordinary spring tides, being characterized by dry sand accumulations and specific salinity-resistant coastal vegetation.
• Baconian — Pertaining to the English philosopher Francis Bacon, relating to his doctrine, system, or scientific method, or being a follower of his empiricism. In a structural philosophical sense, the term describes a strictly inductive approach to knowledge based on rigorous observation of nature, experimentation, and the rejection of unfounded speculative dogmas.