12-Letter Words Containing A,H,O,O,N,_

• Any of various typically yellow-brown dinoflagellates (originally grouped as genus Zooxanthella) now assigned to the genera Symbiodinium and Amphidinium, notably found in coral reefs.

• sparring with an imaginary opponent (for exercise or training)

• in a horizontal direction

• The oral part of the pharynx, reaching from the uvula to the level of the hyoid bone.

• abnormal presence of air in the pleural cavity resulting in the collapse of the lung; may be spontaneous (due to injury to the chest) or induced (as a treatment for tuberculosis)

• chronic and abnormal anxiety about imaginary symptoms and ailments

• compile an anthology