tube nucleus


: the one of the two nuclei formed by mitotic division of a microspore during the formation of a pollen grain that is held to control subsequent growth of the pollen tube and that does not divide again compare generative nucleus

Word History

First Known Use

1939, in the meaning defined above

Time Traveler
The first known use of tube nucleus was in 1939

Dictionary Entries Near tube nucleus

Cite this Entry

“Tube nucleus.” Dictionary, Merriam-Webster, Accessed 25 Feb. 2024.

Kids Definition

tube nucleus

: a nucleus of a pollen grain that is believed to control the growth of the pollen tube
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!