#cavity

• Abcedography / Radiography of an abscess — A specialized radiological technique consisting of taking an X-ray of an abscess cavity, performed immediately following its puncture, evacuation of pus, and subsequent injection of a contrast medium or air to delineate its size, contours, and extension.
• Hollow — A hollow place, concavity, small depression, or indentation formed naturally or artificially on a surface, in a terrain, on a rocky wall, or on an object. In geomorphology, the term describes a micro-landform created through the erosive action of water or soil compaction.
• Hollow — A deepened place, a natural or artificial cavity formed by excavation, erosion, pressing, or structural modeling on a flat surface. In a structural and contextual sense, it defines a relief depression, an anatomical hollow in bone tissue, or a controlled geometric deformation made in an industrial part to allow the assembly or fixation of other components.
• Shallow recess — A small, shallow, or barely perceptible indentation on a flat surface; a cavity of reduced dimensions made manually or appearing naturally. Used adverbially, it expresses a slight positioning or mild penetration, at a moderate distance or depth below the reference level, without generating a deep hollow.
• Bored — Regarding a cylindrical hole or a tubular part: that has undergone the reaming or boring operation, having its internal diameter enlarged, calibrated, and finished according to exact technical dimensions. As an adjective, it describes the final state of geometric precision of a machined internal cavity, ready to receive a perfectly matching shaft or piston.
• Alveolus — An alternative masculine form, rarely used in current Romanian, for the feminine noun 'alveolă'; a small natural cavity, structural hollow, or cell formed in an organ, organism, or material. It appears sporadically in older medical literature or technical translations where the masculine gender from the Latin etymon 'alveolus' was preserved.
• Alveolar structures — The act of forming cellular structures or cavities; as a plural noun, it denotes the totality of small natural cavities within an organ or material (such as pulmonary or dental alveoli). In linguistics, it refers to the class of consonants whose articulation takes place at the ridge of the upper teeth, defining a major structural category in phonetics.
• 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.
• Amphorism — A pathological acoustic phenomenon perceived through auscultation, characterized by the presence of amphoric resonance or metallic breath sounds resembling blowing into an empty container. This structural sign most often indicates the existence of a large pulmonary cavern or the onset of a spontaneous pneumothorax.
• 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.
• Amniogenesis — The biological process of formation, differentiation, and structural development of the amnion and the amniotic cavity during the early stages of embryonic growth. This phenomenon is essential for ensuring the protective fluid environment required for the subsequent growth of the fetus in amniote vertebrates.
• Anfractuosity — A hollow, deep irregularity, sinuous turn, or twisting cavity located on a rocky surface or inside an organic structure. In geomorphology, the term defines specific cracks of karst relief, while in anatomy it describes the deep grooves and complex convolutions of the cerebral cortex.
• Anti-cavity — Preventing, combating, or halting the onset and progression of dental caries; a chemical substance, active ingredient (such as fluoride or xylitol), or oral hygiene product (toothpaste, mouthwash) structurally formulated to protect dental enamel against bacterial demineralization and corrosive acids.
• Antrum — A natural anatomical cavity or chamber, located within a bone or a hollow organ; most commonly used to designate the lower portion of the stomach (pyloric antrum), the maxillary sinus (antrum of Highmore), or the cavity within the temporal bone (mastoid antrum), playing an essential role in storage, secretion, or fluid drainage.
• Ascites — The pathological accumulation of serous fluid (transudate or exudate) within the peritoneal cavity, manifested by a progressive increase in abdominal volume and a sensation of internal tension. This structural phenomenon frequently occurs as a major complication of liver cirrhosis, severe heart failure, kidney diseases, or certain intra-abdominal malignancies.
• Aspergilloma — A pseudotumoral fungal mass, appearing as a ball or conglomerate, developed by the colonization of fungi from the Aspergillus genus (especially Aspergillus fumigatus) within a pre-existing pulmonary cavity (such as those left by tuberculosis, sarcoidosis, or air cysts). Also known as a fungus ball, it develops without invading the surrounding lung tissue, but can cause severe hemoptysis by eroding adjacent blood vessels.
• Aulophytes — A group of lower plants (algae, mosses) or parasitic and saprophytic plant organisms that develop inside hollow cavities, cellular channels, natural tubes, or tissues of other host plants, without necessarily causing immediate structural degradation.
• Azygous — Unpaired; a term used in anatomy to designate certain organs, muscles, or blood vessels (especially the azygous vein) that do not have a symmetrical counterpart on the opposite side of the human or animal body.