Is the sentence will is as strong an ox a simile?

No, the sentence "Will is as strong as an ox" is not a simile. It's a metaphor.

Here's why:

* Simile: Uses the words "like" or "as" to compare two things.

* Metaphor: Makes a direct comparison between two things without using "like" or "as."

The sentence directly compares Will's strength to the strength of an ox, without using "like" or "as."