[ in-truh-thee-kuh l ]
/ ˌɪn trəˈθi kəl /


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

First recorded in 1885–90; intra- + theca + -al1

OTHER WORDS FROM intrathecal

in·tra·the·cal·ly, adverb Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020