Definition: Describing something that has multiple forms or types, especially in the context of biological classifications like subspecies or varieties.

Example: The polytypic nature of the species allows for a wide range of adaptations to different environments.

Definition: A type of synthetic material made from a combination of chemicals, used for making flexible and rigid foams, coatings, and adhesives.

Example: The furniture is made of polyurethane, which makes it both durable and comfortable.

Definition: Describing something that can interact with or affect multiple types of substances, such as toxins or microorganisms, often used in chemistry to refer to elements with a valence of three or more.

Example: The polyvalent vaccine protects against several diseases at once.

Definition: Relating to a type of plastic made from vinyl, often used in various products like pipes and flooring.

Example: The new flooring in the kitchen is made of polyvinyl, which is durable and easy to clean.

Definition: A type of water that was believed to be a special form created in narrow tubes, but is now known to be a false idea.

Example: Scientists once thought polywater had unique properties, but further research proved it was an illusion.

Definition: A rounded knob or handle found on the hilt of a sword, on a saddle, or on a pommel horse.

Example: The knight gripped the pommel of his sword tightly as he prepared for battle.

Definition: To hit or strike repeatedly, often with a heavy object or fist.

Example: He began to pommel the punching bag to improve his strength.

Definition: A pontil is a rod used in glassblowing to hold and shape hot glass during the crafting process.

Example: The glassblower carefully attached the hot glass to the pontil to shape it into a beautiful vase.

Definition: To apply a glassy coating to a surface, often to make it smooth and shiny, similar to porcelain.

Example: The artist decided to porcelainize the metal sculpture to give it a beautiful finish.

Definition: A type of protein that forms channels in cell membranes, allowing small molecules to pass through.

Example: Porins are essential for the transport of nutrients and waste in and out of cells.

Definition: The quality or state of having small holes or spaces in a material, allowing liquids or gases to pass through.

Example: The porosity of the rock allows water to seep through it easily.