Definition of "lordosis" [‖Lor•do•sis]

• An abnormal forward curvature of the spine in the lumbar region. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

• "Once female pigs catch a whiff of androstenone they immediately assume a posture called lordosis, replete with a curved back and wiggly haunches."
• "The queen will signal her willingness to mate with a unique posture: head down, forelegs bent, rear quarters raised to expose the vulva (this raised posture is called lordosis), with the tail raised and held to the side of the body, all designed to accomodate entry by the tom cat's penis."
• "Chronic use of heels can result -- and usually does -- in some degree of kyphosis-lordosis and related pains in the lower back and mid-upper back."