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 -ssociated 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 p-sses 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 m-ss 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, p-sses along the fifth, sixth, and seventh thoracic vertebrae, crosses the midline behind the aorta, esophagus, and thoracic duct, and empties into the azygos vein.