Medical term:

hypostome



hy·po·stome

(hī'pō-stōm),
The central unpaired holdfast organ of the tick capitulum; the hypostome is covered with recurved spines that enable it to serve as an anchoring device while the tick feeds.
[hypo- + G. stoma, mouth]
Farlex Partner Medical Dictionary © Farlex 2012

hypostome

any structure around or below the mouth, such as the oral cone in Hydra.
Collins Dictionary of Biology, 3rd ed. © W. G. Hale, V. A. Saunders, J. P. Margham 2005


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