What does cricoid mean?
The term 'cricoid' refers to the cricoid cartilage, the firm, signet-ring-shaped structure that forms the lowest portion of the larynx, sitting just beneath the more prominent thyroid cartilage. Its name derives from the Greek 'krikos', meaning ring, reflecting its distinctive circular form — it is the only complete cartilaginous ring in the human airway, which gives it vital structural importance in keeping the windpipe open. In everyday usage, 'cricoid' appears almost exclusively in medical and anatomical writing: doctors may refer to 'the cricoid' when locating landmarks for intubation, and anaesthetists speak of 'cricoid pressure' as a technique used during emergency anaesthesia. Though unfamiliar to most laypeople, the word is indispensable in clinical practice and first-aid training.
Relating to or designating the ring-shaped cartilage at the lower front of the larynx.
"The radiologist noted a fracture of the cricoid cartilage following the blunt neck trauma."
The cricoid cartilage itself; the only complete ring of cartilage supporting the human airway.
"Palpate the cricoid just below the thyroid prominence to locate the cricothyroid membrane."
Humans have a single cricoid cartilage, so the plural arises mainly in veterinary or comparative-anatomy contexts referring to multiple animals.
"The dissection lab displayed cricoids from several mammalian species."
Its name literally means 'ring-shaped' — from the Greek word for ring — because it's the only complete ring of cartilage in your entire airway.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of cricoid
The word 'cricoid' comes from the Greek 'krikos' (or 'kirkos'), meaning 'ring' or 'circle', combined with the suffix '-oid', meaning 'resembling' or 'having the form of'. It was adopted into anatomical Latin during the early modern period, when European anatomists systematically gave Greek-based names to bodily structures. The same Greek root ultimately underlies the word 'circus'. Related anatomical terms such as 'cricothyroid' and 'cricoarytenoid' combine the same root with the names of neighbouring structures.
How cricoid is actually used
Predominantly a technical term used in anatomy, medicine, anaesthesia, and emergency care; rarely encountered outside clinical contexts. The noun use ('the cricoid') is common shorthand among clinicians.
Easily confused with cricoid
The thyroid cartilage is the large shield-like cartilage of the larynx (the 'Adam's apple'), whereas the cricoid cartilage is the smaller ring-shaped cartilage lying just below it.