#cave

• Abud — A rare regional or archaic term used to describe an object, container, or domestic space that is hollowed out, deeply concave, massive, or disproportionately bulged. In certain isolated vernacular dialects, the adjective can also refer to a primitive landform or a rudimentary natural shelter, retaining a connotation linked to archaism, solidity, and raw utility in the peasant household of yesteryear.
• Aggtelek-Josvafö — A composite geographic name in Hungary, associated with the famous karst region in the north of the country (Aggtelek and Jósvafő area), globally known for its spectacular cave system (such as Baradla-Domica), listed as a UNESCO World Heritage site. The term also defines a railway junction or tourist access station to the Aggtelek National Park.
• Albotin — A defuncted medieval cave Eastern Orthodox monastery complex, located in northwestern Bulgaria, near the city of Vidin, carved into a limestone cliff in the Rabrova River valley and used by ascetic monks during the 14th-15th centuries.
• Algarve — The southernmost administrative region of continental Portugal, world-renowned for its dramatic Atlantic coastline, golden beaches, and limestone cliffs. Its capital is Faro. Historically, the region retains a strong Moorish heritage, with its name deriving from Arabic 'Al-Gharb' (The West).
• Allogenetic — Pertaining to or relating to allogenesis; generated, developed, or supplied from external sources foreign to the local environment. In speology and karstology, it describes a karst system, cave, or watercourse fed by precipitation or rivers that originate on neighboring non-karstifiable rocks (such as granites or schists) and subsequently enter the limestone massif.
• Altamira — A famous cave located in northern Spain (near Santillana del Mar, Cantabria), globally renowned for its exceptional prehistoric rock art from the Upper Paleolithic (Solutrean and Magdalenian cultures). This structural archaeological site, designated a UNESCO World Heritage site, houses remarkable polychrome paintings depicting bisons, horses, and handprints, considered the 'Sistine Chapel of Paleolithic Art' due to the technical mastery of drawings executed with charcoal and ochre.
• Amphoric — Relating to the characteristic breath sound or murmur resembling that produced by blowing across the mouth of an empty jug; a structurally altered pathological pulmonary murmur indicating the presence of a large cavity (tuberculous cavern) or a significant pneumothorax within the thoracic cage.
• Amphorophony — A pathological acoustic phenomenon observed during thoracic auscultation, characterized by an altered timbre of the voice or breath sounds, which acquire a distinct metallic resonance similar to speaking across the mouth of an empty jug. This structural anomaly indicates the presence of a large, aerated pulmonary cavity with rigid walls, or the existence of a pneumothorax.
• Anemolite — A crystalline cave deposit or speleothem (modified stalactite) whose vertical growth axis is structurally deflected or curved in a constant direction due to the presence of permanent underground wind or air currents inside the cave during the crystallization process.
• Anophthalmic — Having no eyes; completely lacking the eyeball or visual organs. In zoology, it describes cave-dwelling, abyssal, or underground animal species (such as certain insects, fish, or crustaceans) that, following evolutionary adaptation to total darkness, have structurally lost their eyes. In medicine, it refers to an individual affected by anophthalmia, a rare congenital developmental anomaly of the orbit.
• Antholite — A mineral formation or underground sedimentary concretion, formed through the gradual precipitation and accumulation of mineral salts within specific karst cavities or geological layers. This structural crystalline aggregate often develops in the form of stalactites or branched crusts, having a chemical composition dictated by the cave's microclimate and the purity of hydrothermal solutions circulating through the rock mass.
• Anthropolit — A fossilized human remain or a human body petrified through incrustation with mineral substances (lime, silica) inside cave sediments or ancient geological layers. This rare technical term is used in fossil studies to denote prehistoric skeletal specimens that have undergone a complete process of diagenesis and structural mineralization.
• Anthropospeleology — An interdisciplinary field at the intersection of speleology, archaeology, and anthropology, studying the traces of human activity in caves and subterranean cavities from ancient times to the present. This science investigates prehistoric habitations, rock art, the ritual use of caves, and the transformations humans have brought to the underground environment throughout evolution.
• Apuseni — A major mountain group located in western Romania, representing the northern subdivision of the Western Carpathians; this mountain massif is structurally characterized by a spectacular karst relief, an impressive number of caves, deep gorges, and depressions populated by traditional communities known as the Moți.
• Aragonite — A mineral from the natural carbonate class, representing an unstable crystalline form of calcium carbonate and a high-pressure polymorph of calcite. It crystallizes in the orthorhombic system, frequently forming long prismatic crystals, acicular aggregates, or specific encrustations such as flos ferri, and constitutes the primary mineral component making up the nacre of mollusk shells and fine pearls.
• Ardealite — A very rare secondary phosphate mineral, structurally composed of hydrated calcium phosphate-sulfate, with the chemical formula Ca2(PO4)(SO4)·4H2O. It typically forms as an alteration product in cave guano deposits through the reaction of acidic phosphate solutions with surrounding limestone, first discovered and described in 1932 in the Cioclovina Cave in Hunedoara County, Romania, from which it derives its name structurally linked to the Ardeal region.
• Areni — The plural form of the rare noun 'arenar' or 'arcan'; also the proper name of a famous locality and archaeological site in Armenia (Areni), globally renowned for the discovery of the world's oldest winery and an intact prehistoric leather shoe. Its structural or geographical meaning points directly to prehistoric Caucasian cultures and the origins of viticulture.
• Pit cave — An endokarstic geological formation consisting of a cave or natural cavity developed predominantly vertically, in the shape of a deep shaft or a steep funnel, formed by the chemical dissolution of limestone by infiltrating waters or by the collapse of an underground chamber ceiling. Avens directly connect the ground surface to the subterranean hydrological network, being structures of great interest for speleological exploration and the study of karstic landforms.