Which term refers to an abnormally increased curvature of the spine?

The term that refers to an abnormally increased curvature of the spine is lordosis. Lordosis specifically describes a condition characterized by an exaggerated inward curve of the lumbar spine, which is the lower back. This condition can lead to discomfort and affect posture, as it alters the natural alignment of the spine.

Lavage refers to the process of washing out an organ or cavity, which is not related to spinal curvature. Metastasis is a term used in oncology to describe the spread of cancer from one part of the body to another, and lumbar pertains to the lower back region but does not specifically indicate an abnormal curvature. Thus, lordosis is the most accurate term for describing an abnormal increase in spinal curvature.