lithocyst

== English == === Etymology === From litho- +‎ cyst. === Noun === lithocyst (plural lithocysts) (zoology) A sac containing otoliths, found in medusae and other invertebrates. (botany) A small, siliceous structure found in diatoms and some other types of algae that fills with gas or oil, controlling the buoyancy of the algae. === Anagrams === cystolith