1. A small pit or depression on an organ's surface. 2. Cavity in a gland. 3. Cavity in the lungs. 4. Tooth socket in a jaw bone. 5. Found in echinoderms. 6. Gastropods. The end portion of a tubule.
What is ALVEOLUS?
ALVEOLUS: "An alveolus is a part of Artistode's lantern, a structure that is see in echinoderms."
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