Definition: Relating to the areas on the bodies of certain sea creatures, like starfish, where important systems such as nerves and blood vessels are located.

Example: The ambulacral system is crucial for the movement and feeding of echinoderms.

Definition: A section on the underside of a starfish or similar sea creature where small tube-like feet extend and retract.

Example: The ambulacrum of the starfish is essential for its movement and feeding.

Definition: A single-celled organism that can change shape, often found in water or soil, and can move by extending parts of its body.

Example: The ameba moved through the water, changing its shape as it searched for food.

Definition: Relating to or having characteristics similar to a type of single-celled organism that can change shape, known for its ability to move and feed by extending parts of its body.

Example: The ameban characteristics of the organism were evident under the microscope.

Definition: Describing a plant or tree that produces catkins, which are cylindrical flower clusters that hang down.

Example: The amentiferous trees in the forest were in full bloom during spring.

Definition: A type of purple or violet crystal that is a form of quartz, often used in jewelry and as a gemstone.

Example: She wore a beautiful amethyst pendant around her neck.

Definition: Having a color similar to that of an amethyst, which is a purple or violet hue.

Example: The amethystine hue of the sunset was breathtaking.

Definition: A rare and precious gemstone that resembles opal, formed from the fossilized shells of ancient sea creatures called ammonites.

Example: The jeweler showcased a stunning necklace featuring a vibrant ammolite pendant.

Definition: A type of fossilized shell from an extinct sea creature that had a coiled shape and lived a long time ago, especially during the time of dinosaurs.

Example: The ammonite fossils found in the cliffside provide valuable insights into prehistoric marine life.

Definition: An amoeba is a tiny, single-celled organism that can change its shape. It lives in water or damp places and moves by stretching out parts of its body called pseudopods. Amoebas can be free-living or can live inside other organisms as parasites.

Example: The amoeba moved through the water, extending its pseudopods to capture food.