* A science or field of study: biology, geology, psychology
* A discourse or treatise: dialogue, monologue, eulogy
* A principle or doctrine: ideology, theology, mythology
* A reason or explanation: rationale, epilogue, prologue
Here are some examples:
* Bio-logos (biology): the study of life
* Geo-logos (geology): the study of the Earth
* Psycho-logos (psychology): the study of the mind
* Dia-logos (dialogue): a conversation between two or more people
* Mono-logos (monologue): a speech given by one person
* Eu-logos (eulogy): a speech praising someone who has died
* Ide-logos (ideology): a system of ideas and beliefs
* Theo-logos (theology): the study of religion
* Myth-logos (mythology): a collection of myths and legends
Understanding the meaning of "-logos" can help you decode the meaning of many words in English and other languages.