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half ring

noun
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Definition of half ring

: one of the incomplete cartilaginous rings that support the upper part of the bronchial tubes of most birds and in singing birds form a part of the syrinx

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“Half ring.” The Merriam-Webster.com Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/dictionary/half%20ring. Accessed 14 December 2019.

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