Quad Is Four, Whatever It Is Attached To
A quad is a courtyard, a muscle, a bike or a set of four. All of them count to four.
Quad is short for several words built on Latin *quattuor*, four: a *quadrangle* (a four-sided courtyard), the *quadriceps* (a four-headed thigh muscle), a *quad bike* (four wheels), *quadruplets*, and a *quadrilateral*. Each shortening happened separately, which is why a student, a physiotherapist and a farmer mean entirely different things by the same syllable — but all of them mean four. The thigh muscle is literally four-headed, being four distinct muscles sharing one tendon.
- A courtyard. *The college quad.*
- A thigh muscle. *The quads.*
- A four-wheeled bike. *A quad bike.*
- One of four babies. *Quads.*
- Latin — *quattuor*, four. *The root.*
Word forms
| Form | Word | Example |
|---|---|---|
| Noun | quad | A quad. |
| Plural | quads | Quads. |
| Full form | quadrangle | A quadrangle. |
| Full form | quadriceps | The quadriceps. |
| Latin | quattuor | Four. |
- They crossed the quad.College.
- He strained a quad.Muscle.
- A quad bike.Vehicle.
The quattuor family
- Quadrangle — a four-cornered space
- Quadriceps — the four-headed muscle
- Quarantine — originally forty days, from *quaranta*
- Quarter — a fourth part
- Square — from *exquadra*, made four-sided
Shortened from *quadrangle*, *quadriceps* and similar words, all from Latin *quattuor*, four.
Why is the thigh muscle called a quad?
Because the quadriceps is four distinct muscles sharing a single tendon, literally four-headed.
Is quarantine related?
Yes, through the Latin number family. It originally meant forty days of isolation.