noun Cell Biology.

the structures of a cell that are revealed by electron microscopy.

Origin of ultrastructure

First recorded in 1935–40; ultra- + structure
Also called fine structure.
Related formsul·tra·struc·tur·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for ultrastructure



the minute structure of a tissue or cell, as revealed by microscopy, esp electron microscopy
Derived Formsultrastructural, adjective
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012