Subglottis

Part of the voice box (larynx) - the area below the vocal cords that contains the cricoid cartilage and continues down into the windpipe (trachea).
Found on http://www.cancerhelp.org.uk/utilities/glossary/index.htm?search=s

subglottis

The lower part of the larynx; the area from just below the vocal cords down to the top of the trachea. ... (12 Dec 1998) ...
Found on http://www.encyclo.co.uk/local/20973

subglottis

The lowest part of the larynx; the area from just below the vocal cords down to the top of the trachea.
Found on http://www.cancer.gov/dictionary?expand=S
No exact match found