The word "Casserian" is spelled with a "c" followed by a "double s." The sound of the "c" is /k/ and the "ss" makes a hissing sound /s/. The stress falls on the third syllable, which is marked with an accent in IPA as /səˈsɛriən/. The word does not seem to have a clear meaning or origin, and may be a made-up term. When spelling this word, it is important to remember the two "s's" and the stressed syllable.
Relating to or described by Casser or Casserio.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.