#structural properties

• Anthracitous — Containing anthracite, possessing the characteristics, appearance, or structural composition of anthracite; a sedimentary rock, schist, or carboniferous deposit rich in highly evolved coal, displaying a discreet semi-metallic luster and high density. In an industrial sense, it describes materials or combustion residues that preserve a high concentration of structurally bound fixed carbon.
• Female tanner — A woman who processes raw animal hides through traditional chemical and mechanical methods; a female tanner. As an adjective, it describes an organic substance (oak bark, bran, salts) or a fluid solution that has the structural property of tanning hides, eliminating moisture and bacteria to ensure the long-term preservation of the material.
• Birthwort — A common name used to designate any plant belonging to the genus Aristolochia, characterized by erect or climbing stems and flowers with a simple perianth shaped like a funnel or a bent pipe. Historically, these plants were used as empirical remedies in gynecology to facilitate childbirth (hence its etymology), but their modern use is strictly banned due to deadly risks of nephrotoxicity.
• Acute-angled — Having all angles acute, meaning each angle measures strictly less than 90 degrees (or pi/2 radians); a term structurally used in geometry to classify triangles based on the size of their internal angles. Such a mathematical model implies the property that the orthocenter of the figure always lies inside its perimeter.