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.
See subsidiary cell.
- Accessory cephalic vein
accessory cephalic vein accessory cephalic vein n. A variable vein that passes along the radial border of the forearm to join the cephalic vein near the elbow.
- Accessory chromosome
. Historical Examples In these latter stages the nucleolus has entirely faded out and nothing suggesting an accessory chromosome is present. Studies in Spermatogenesis (Part 1 of 2) Nettie Maria Stevens Thionin was found to be a very useful stain for distinguishing between the accessory chromosome and an ordinary nucleolus. Studies in Spermatogenesis (Part 1 […]
- Accessory fruit
a fruit, as the apple, strawberry, or pineapple, that contains, in addition to a mature ovary and seeds, a significant amount of other tissue. noun another name for pseudocarp accessory fruit A fruit, such as the pear or strawberry, that develops from a ripened ovary or ovaries but also has tissue derived from part of […]
- Accessory gland
accessory gland accessory gland n. A small mass of glandular tissue detached from, but lying near, another gland of similar structure. Historical Examples The accessory gland in the male (fig. 43, ag) is probably a modification of one of these organs. The Works of Francis Maitland Balfour, Volume 1 Francis Maitland Balfour
- Accessory hemiazygos vein
accessory hemiazygos vein accessory hemiazygos vein n. A vein that is formed by the union of the fourth to seventh left posterior intercostal veins, passes along the fifth, sixth, and seventh thoracic vertebrae, crosses the midline behind the aorta, esophagus, and thoracic duct, and empties into the azygos vein.