osmotic pressure Pressure required to prevent the flow of solvent through a membrane that has different concentrations of salt on either side.
osphradium n.; pl. -dia [Gr. osphradion, strong smell] (MOLL) 1. In Gastropoda, a small sensory organ on the posterior margin of each afferent gill membrane that functions as a chemoreceptor and also determines the amount of sediment in the inhalant current. 2. In Bivalvia, located in the exhalant chamber, doubtfully homologous to Gastropods.
osseous a. [L. os, ossis, bone] Composed of or resembling bone.
ossicle n. [L. dim. os, ossis, bone] 1. A small nodule of chitin that resembles bone. 2. (ARTHRO: Crustacea) Teeth and tooth-like process in the gastric mill. 3. (ARTHRO: Insecta) For Diptera, see axillary sclerites. 4. (echinod) Plates, spicules and rods that make up the structure of the endo-skeleton.
ossiculum n. [L. dim. os, ossis, bone] 1. An ossicle. 2. (MOLL: Bivalvia) A small calcareous plate reinforcing an internal ligament; a lithodesma.
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