In anatomical and medical terminology, -coele designates a cavity, chamber, or fluid-filled space within a structure, particularly the brain’s ventricles (diencephalocoeles), spinal canal, or embryonic body cavities (coelom). It differs slightly from -cele (hernia/protrusion) by emphasizing the hollow space itself rather than a herniated sac, though the terms overlap in clinical use for congenital defects.
greek - From Ancient Greek koilos (κοῖλος), meaning “hollow, concave, cavity.”
Latinized as -coele in scientific nomenclature (e.g., blastocoel), entering English medical vocabulary in the 19th century alongside -cele (from kēlē, “hernia”).
The spelling -coele preserves the Greek “oe” diphthong for precision in embryology and neuroanatomy.