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.
Coal comes in different types, depending on the extent of compaction and alteration. Obviously, we define the term 'sediment' pretty broadly to classify coal! At the other end are a group of rocks called evaporites. They're rocks made of sediment produced by purely chemical reactions as water evaporates. Inland lakes or seas, like the Dead Sea, are environments where that can happen. The two common evaporite rocks are gypsum and salt. In the middle of this category are rocks made from sediment originally produced by either plants or animals living in water.