Explore "wheel": its ancient etymology linked to turning, its diverse definitions as noun and verb for circular motion or objects, and its rich use in idioms and technology.

Explore "tooth": its ancient Indo-European roots defining a biting structure. This entry covers meanings (body part, projection, effectiveness), diverse examples, and idioms for this versatile term.

Explore "machine": its Greek/Latin roots defining a device or contrivance. This entry covers meanings (mechanical, political, human), diverse examples, and common idioms of this pervasive term.