centriole definition
Noun. 1. centriole-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. cell organ, cell organelle, organelle-a specialized part of a cell; analogous to an organ; the first organelle to be identified was the nucleus.entriole. 1. Either of two organelles near the nucleus involved in cell division. 2. One of a group of tiny tubules near the nucleus of a cell. Centrioles play a part in cell division.