Meaning: A home appliance for washing clothes and linens automatically. Classified under: Nouns denoting man-made objects. Synonyms: automatic washer; washing machine; washer. Hypernyms (washer is a kind of...): white goods (large electrical home appliances (refrigerators or washing machines etc.) that are typically finished in white enamel)
Diatoms are a major group of algae, and are among the most common types of phytoplankton. Diatoms are unicellular, although they can form colonies in the shape of filaments or ribbons (e.g. Fragilaria), fans (e.g. Meridion), zigzags (e.g. Tabellaria), or stars (e.g. Asterionella). unique feature of diatom cells is that they are enclosed within a cell wall made of silica (hydrated silicon dioxide) called a frustule.
Lesson Summary. Diatoms are single-celled algae that form a silica-based cell wall. They are broken up into two major groups, the centric diatoms and the pennate diatoms, based on the form of their frustule.Diatoms live in all aquatic environments, including the ocean, freshwater lakes, and moist soils.esson Summary. Diatoms are single-celled algae that form a silica-based cell wall. They are broken up into two major groups, the centric diatoms and the pennate diatoms, based on the form of their frustule.