#agona

• Agonic line — An imaginary line on the Earth's surface (an isogonic line of zero value) connecting points where the magnetic declination is zero; along this line, a compass needle points exactly to true geographic north.
• Agonadism — A highly rare congenital medical condition characterized by the complete structural and functional absence of gonads (testes or ovaries), caused by an anomaly in early embryonic development; it results in a lack of sex hormones and requires life-long hormone replacement therapy.
• Agonal — Relating to the period of terminal agony or the final moments before death; it describes the irregular, involuntary, and inefficient physiological patterns (such as agonal breathing) exhibited by an organism in structural collapse.
• Agonal — The plural form (feminine and neuter) of the adjective agonal; it refers to clinical phenomena, spasms, or manifestations that accompany the final death throes, representing the disorganized and reflex attempts of an organism in its terminal stage.
• Agonic — Relating to terminal agony or the final struggle before clinical death; synonymous with agonal, it describes the states, spasms, or inefficient respiratory reflexes displayed by an organism experiencing terminal biological collapse.
• Akermanite — A mineral belonging to the melilite group, consisting of a complex calcium and magnesium silicate with the chemical formula Ca2MgSi2O7; it crystallizes in the tetragonal system and frequently occurs in silica-poor effusive igneous rocks, in contact-metamorphosed limestones, or as a major structural component in industrial metallurgical slags. This high-temperature mineral forms a continuous isomorphous series with gehlenite, being utilized in petrological studies to determine the thermodynamic conditions of magma solidification.
• Allen — A surname and given name of Celtic/English origin widely used internationally, celebrated in culture notably through Woody Allen, the famous American director and screenwriter, or Paul Allen, co-founder of Microsoft. In industrial and technical terminology, the term designates a standardized system of hexagonal socket screws and their corresponding tool (Allen key).
• Apophyllite — A group of minerals from the silicate class (specifically hydrated potassium calcium phyllosilicates containing fluorine), characterized by transparent or white tetragonal or pseudo-cubic crystals with a pronounced pearly or vitreous luster; a mineral belonging to this group. Its name derives from its specific tendency to exfoliate into flakes when heated under a blowpipe due to the loss of crystallization water.