Name for quadratic functions with no linear term

Question

Is there any special name for a function of the form $ax^2+c$

(i.e. a quadratic function with no linear term)?

"centered quadratic" or something?

Answer 1

As hinted by Peter and confirmed by Web search, this is called a pure quadratic. https://develacademy.com/pure-quadratic-equation/

Answer 2

I've never heard of such a term. If I had to make one up, I would borrow terminology from cubic equations and call it a "depressed" quadratic.