crico-, cric- +
(Greek: ring; used in the extended sense of pertaining to the [ring-shaped] cartilage that forms the back and lower part of the laryngeal cavity)
2. Relating to, or in the region of, the lowermost cartilage of the larynx.
The cricoid (from the Greek krikoeides, "ring-shaped") is the only complete ring of cartilage around the trachea which is a tube-like portion of the breathing or "respiratory" tract that connects the "voice box" (larynx) with the bronchial parts of the lungs.