Entry 3 senses · 3 variants Webster, 1913 Nucleate · Nu·cle·ate · IPA a. v. t. v. i. 01 a. Having a nucleus; nucleated. 1. Having a nucleus; nucleated. 02 v. t. To gather, as about a nucleus or center. 1. To gather, as about a nucleus or center. 03 v. i. To form into a nucleus or multiple nuclei; as, raindrops may nucleate around silver iodide crystals. 1. To form into a nucleus or multiple nuclei; as, raindrops may nucleate around silver iodide crystals.