"Opisthobranch" Natural Recordings by Native Speakers
A fascinating word!
Opisthobranch refers to a type of marine snail or sea slug that belongs to the clade Opisthobranchia. It is a group of pulmonate gastropod mollusks that are characterized by having a reduced or absent shell, and are often brightly colored and adorned with elaborate patterns. Opisthobranchs are generally soft-bodied and range from simply shelled to completely shell-less, and are often referred to as "sea hares" or "sea slugs".
In anatomy, an opisthion is the back or posterior part of the cranium, or skull, especially the part that lies behind the foramen magnum (the opening through which the spinal cord passes).