Catabasial is a rarely used word in the English language. Its meaning refers to a gradual lowering or descending process. The word is spelled with five syllables: "ca-ta-ba-si-al" /kəˈtæbəziəl/. The first syllable, "ca", is pronounced with a stressed "kə" sound, followed by three reduced syllables "ta", "ba", and "si". The final syllable "al" is pronounced with a schwa sound, making the last two syllables, "si" and "al", unstressed. The IPA phonetic transcription provides a clear understanding of how to pronounce this unusual word.
Noting a skull in which the basion is lower than the opisthion.
A practical medical dictionary. By Stedman, Thomas Lathrop. Published 1920.