Centriole and Focal point

Centriole noun - One of a pair of small cylindrical cell organelles near the nucleus in animal cells; composed of nine triplet microtubules and form the asters during mitosis.

Focal point and centriole are semantically related. in center topic. In some cases you can use "Focal point" instead a noun "Centriole", when it comes to topics like middle point.

Focal point noun - A point of convergence of light (or other radiation) or a point from which it diverges.

Centriole and focal point are semantically related. You can use "Centriole" instead a noun phrase "Focal point".