#annular
- Annularia — A fossil plant genus of the order Equisetales, characteristic of the Carboniferous and Permian periods, representing the star-shaped whorled foliage of the ancient trees known as Calamites. The linear or lanceolate leaves were structurally joined at the base into a distinct ring, forming a circular fossil imprint that provides crucial clues about the structure of Paleozoic swamp forests.
- Annular — Having the shape of a ring or pertaining to a ring; (noun) the fourth digit of the human hand, located between the middle and little fingers, traditionally where the wedding ring is worn; (astronomy) a type of solar eclipse in which the Moon covers only the center of the Sun, leaving a bright outer ring visible.
- Aviocoleopter — An unconventional or experimental type of aircraft (or flight apparatus design) characterized by an annular, cylindrical, or tubular wing that completely surrounds the fuselage or propulsion system. This distinctive structural design, inspired by the elytra of certain beetles (coleoptera), offers theoretical advantages regarding vertical take-off and landing (VTOL), airflow channeling, and reduction of aerodynamic drag at specific angles of attack.