Definition: A type of freshwater algae that belongs to the genus Anabaena, which can sometimes be found in drinking water and may create unpleasant tastes and smells.

Example: The presence of anabaena in the lake made the water taste strange.

Definition: Relating to winds or air currents that move upward.

Example: The anabatic winds helped the gliders gain altitude effortlessly.

Definition: A type of fish that has a unique eye structure, allowing it to see both above and to the sides at the same time, making it appear to have four eyes.

Example: The anableps is known for its remarkable ability to see both above and below the water's surface.

Definition: A large, nonvenomous snake found in tropical South America that kills its prey by wrapping around it and suffocating it. These snakes can grow very long, sometimes reaching lengths of over 30 feet.

Example: The anaconda is known for its impressive size and strength, making it one of the largest snakes in the world.

Definition: Referring to fish that travel from the ocean to freshwater rivers to reproduce.

Example: Salmon are anadromous fish that return to their birthplace to spawn.

Definition: A diagram that shows the position of the sun in the sky at a specific time each day throughout the year, creating a figure-eight shape.

Example: The analemma helps astronomers understand the sun's changing position over the seasons.

Definition: Not having a fixed point or support; unable to stay in one place or direction.

Example: The boat was anchorless, drifting aimlessly in the open sea.

Definition: A type of plant that belongs to a group of herbs known for their rough texture and hairy leaves, featuring clusters of trumpet-shaped flowers.

Example: The garden was filled with beautiful anchusa plants, their blue flowers attracting many bees.

Definition: A type of mineral made of aluminum silicate, often found in crystal form and can come in different colors.

Example: Andalusite is often used in jewelry due to its unique colors and crystal structure.

Definition: A type of volcanic rock that is usually gray and has a fine texture, mainly made up of minerals like plagioclase and feldspar.

Example: The geologist collected a sample of andesite to study its mineral composition.