Relating or devoted to the study of the fundamental nature of knowledge, reality, and existence
a philosophical question
An egg-shaped glass vessel with a long neck, used for heating substances over a long period of time.
A pure or essential oil; specifically = brick-oil.
Historical = philosophers' tree.
The branch of philosophy which deals with the principal concepts of logic, such as reference, necessity, negation, etc.
Now historical, a period of forty days, used especially by alchemists.
A member of a group of early 19th-cent. radicals whose advocacy of political reform was based on Benthamite utilitarian philosophy.
= philosophers' stone.
Combining psychological and philosophical concerns or interpretations.
The branch of philosophy that deals with the clarification of existing concepts and knowledge
The views of or reforms advocated by the philosophical radicals.