(bound form) natural; innate; gifted by birth

The last of the four seasons; specifically the three months from the start of winter to the start of spring in the lunar calendar

A colorless, aromatic, flammable liquid chemical derived from coal and petroleum; used as a solvent, fuel, and in manufacturing synthetic resins and pesticides.

Chemical prefix denoting an organic group containing three carbon atoms, such as propyl or propane

the number two; 2

peptide; an organic compound composed of amino acids linked by chemical bonds

A type of organic compound formed by the reaction of an alcohol and an acid with the loss of water. Low molecular weight esters are typically fragrant liquids used as solvents or flavorings, while high molecular weight esters are solids or thick liquids found in fats and oils.