13-Letter Words Containing: P,R,O,N,A,O,S,_

• chronic and abnormal anxiety about imaginary symptoms and ailments

• annihilation by vaporizing something

• the process of becoming a vapor

• a system of beliefs and practices based on the philosophy of Rudolf Steiner; it claims to integrate the practical and psychological in child-centered education

• any of numerous velvety-skinned wormlike carnivorous animals common in tropical forests having characteristics of both arthropods and annelid worms

• A branch of pharmacology that studies medical substances that are derived from natural sources, and their recognition.

• the male reproductive cell; the male gamete

• Excessive expansion, especially expansion that is not sustainable

• A gastropod with gills behind the heart, formerly thought to belong to a single group.

• (of gills) Placed behind the heart.

• (of a gastropod) Having gills placed behind the heart.

• the phenomenon in which waves of light or other radiation are restricted in direction of vibration

• the condition of having or giving polarity