- Immunology. any of various cells of the immune system that work with T or B cells to initiate a specific immune response.
- Also called subsidiary cell. Botany. a plant epidermal cell associated with guard cells and different morphologically from other epidermal cells.
Origin of accessory cell
First recorded in 1830–35
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
- A plant epidermal cell that is located next to a guard cell in the stoma of a leaf and differs in structure from other epidermal cells. Also called accessory cell
- See subsidiary cell.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.