"Polygala" Natural Recordings by Native Speakers
Polygala is a genus of flowering plants in the family Polygalaceae, commonly known as the milkwort family. It contains around 500 species, many of which are found in tropical and subtropical regions.The word "polygala" comes from the Greek word "polygalo", meaning "many milk". This refers to the way the plant's flowers, which resemble small cups, secrete a milky sap.Polygala plants are known for their showy flowers, which are often pink, purple, or white in color. They are also known for their round or oval-shaped fruits, which contain tiny seeds.Some species of Polygala are used in traditional medicine, while others are cultivated as ornamentals in gardens.
The term "polyestrous" refers to a type of reproductive cycle in female mammals that have multiple estrous cycles (heat cycles) per year, as opposed to being "estrous", having only one cycle per year, or "monestrous", having only one cycle in their entire lifetime.In more detail, polyestrous females can exhibit multiple periods of heat or estrus, during which they are receptive to mating and can become pregnant. This is in contrast to other animals that are monestrous, where their reproductive cycle occurs only once per year.Examples of polyestrous females include cats (they can have 2-4 estrous cycles per year), ferrets (they can have up to 6 cycles), and indirect evidence suggests some species of small (e.g. certain primates), or domesticated (e.g. dogs) can have more per year.
Polyfluoroethylene is a type of synthetic polymer which is a co-polymer of ethylene and vinyl fluoride (a 1:1 ratio). The monomer units have a fluorine atom attached to a carbon atom of a polyethylene backbone.