| APLASIA | • aplasia n. (Pathology) A condition marked by the incomplete development, or entire absence, of an organ or tissue. • APLASIA n. defective development or absence of an organ. | 
| ACHALASIA | • achalasia n. (Medicine) A neuromuscular condition where a ring of muscles is unable to relax fully, causing obstruction… • ACHALASIA n. (Greek) failure of the muscles of the lower part of the oesophagus to relax, which prevents food from passing into the stomach. | 
| ANAPLASIA | • anaplasia n. (Biology) A reversion of differentiation in cells that is characteristic of malignancy in tumours. • ANAPLASIA n. reversion of plant or animal cells to a simpler form. | 
| DYSPLASIA | • dysplasia n. (Pathology) Abnormal development of cells or tissue, often a precancerous stage of growth. • DYSPLASIA n. abnormal tissue development. | 
| NEOPLASIA | • neoplasia n. (Biology) The formation of new tissue. • neoplasia n. (Medicine) The formation of a neoplasm. • NEOPLASIA n. the formation or presence of a morbid growth of tissue. | 
| CATAPLASIA | • cataplasia n. The degeneration of cells or tissue. • CATAPLASIA n. the degeneration of cells and tissues to a less highly developed form. | 
| HYPOPLASIA | • hypoplasia n. Underdevelopment or incomplete development of a tissue or organ, especially when caused by an inadequate… • HYPOPLASIA n. the incomplete development of an organ or part, also HYPOPLASTY. | 
| METAPLASIA | • metaplasia n. (Biology) The conversion of one type of tissue into another. • METAPLASIA n. the change of one kind of tissue into another, also METAPLASIS. | 
| HYPERPLASIA | • hyperplasia n. (Medicine) An increase in the size of a tissue or organ due to increased number of cells. • HYPERPLASIA n. an abnormal or unusual increase in the elements composing a part, such as cells composing a tissue. | 
| HETEROPLASIA | • heteroplasia n. The presence of a tissue or organ in an abnormal place. • HETEROPLASIA n. the development of abnormal tissue or tissue in an abnormal place. | 
| ACHONDROPLASIA | • achondroplasia n. (Teratology) A genetic disorder, the most common form of short limb dwarfism. • ACHONDROPLASIA n. a condition where cartilage does not develop normally, resulting in dwarfism. |