Definition: A type of compound that contains arsenic, often formed during the process of extracting metals like iron, cobalt, nickel, and copper from their ores.

Example: The miners discovered speiss while processing the copper ore.

Definition: Relating to the study or exploration of caves.

Example: The speleological research revealed many new species living in the cave.

Definition: A person who studies caves and the science related to them.

Example: The speleologist explored the deep cave to learn more about its formation.

Definition: The study and exploration of caves, including their formation, structure, and ecosystems.

Example: He is passionate about speleology and often explores new caves during his vacations.

Definition: A type of zinc that is often used in various forms like ingots, slabs, or plates for commercial purposes.

Example: The factory produces spelter for use in construction and manufacturing.

Definition: A cave, cavern, or grotto where people can explore.

Example: The spelunk was filled with beautiful stalactites and stalagmites.

Definition: To explore caves, especially as a hobby or for adventure.

Example: They decided to spelunk in the nearby cave system during their vacation.

Definition: A person who explores caves for fun or as a hobby.

Example: The spelunker discovered a hidden underground lake during his expedition.

Definition: A male reproductive cell that is involved in fertilization. It is produced by males and combines with a female egg to create a new organism.

Example: The scientist studied the sperm to understand its role in reproduction.

Definition: A white, waxy substance found in the heads of certain whales, used in making candles, ointments, and cosmetics.

Example: Spermaceti was once highly valued for its use in high-quality candles.

Definition: A cup-shaped or flask-shaped structure in certain fungi and lichens where reproductive cells are produced.

Example: The scientist observed the spermagonium under the microscope to study its reproductive cells.