Definition

A theoretical shape of the Earth that represents the average sea level across the globe, extending under land areas as well.

Example

Scientists use the geoid to understand sea level changes and the Earth's gravitational field.

Conversation

Have you ever heard of the term geoid?

Yeah, I think it refers to the shape of the Earth, right?

Exactly! It represents the mean sea level across the globe.

That's interesting — I never knew it had such a specific definition.

Synonyms & Antonyms

Root Explanation

Geoid is formed from "geo-" (from Greek "gē", meaning earth) and "-oid" (from Greek "eidos", meaning form or shape). The term geoid refers to the shape of the Earth as determined by its gravitational field, resembling an equipotential surface of the Earth's gravity.

Memory Tip

Think of 'geo-' meaning earth and '-oid' meaning shape — the geoid is the shape of the Earth.

Visually Confused Words