- Anatomy. situated within the thecal sac: covering the spinal cord.
- Medicine/Medical. administered into the thecal sac: intrathecal injections.
- Pharmacology. anesthesia administered into the thecal sac: She was given an intrathecal during labor.
Origin of intrathecal
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018