Question

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a dacryocystectomy is the removal of the sac.
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Explanation:

The term "dacryocystectomy" is a medical - surgical term. "Dacryo -" refers to the lacrimal system related to tears, and "cystectomy" means removal of a cyst or sac. In the context of the lacrimal system, it is the removal of the lacrimal sac.

Answer:

lacrimal