1) Descensus 2) Prolapse 3) Prolapsus 
Glossoptosis is a medical condition and abnormality which refers to the downward displacement or retraction of the tongue. It is one of the features of Pierre Robin Sequence and Down Syndrome. ...
Glossoptosia ... Downward displacement of the tongue. ... Origin: Glosso-+ G. Ptosis, a falling ... (05 Mar 2000) ... 
Type: Term Pronunciation: glos′op-tō′sis, -op-tō′sē-ă Definitions: 1. Displacement of the tongue toward the pharynx.
[n] - abnormal downward or back placement of the tongue
glossoptosis 1. A downward displacement or retraction of the tongue towards the pharynx. 2. A dropping of the tongue downward out of its normal position.