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English word intrathecal comes from English thecal (Of or pertaining to a theca.. Possessing a theca.), English intra- (A prefix signifying inside, within, interior, during.)
thecal (English)
Of or pertaining to a theca.. Possessing a theca.
intra- (English)
A prefix signifying inside, within, interior, during.
intrathecal (English)
Delivered into the spinal canal (intrathecal space surrounding the spinal cord), e.g. a spinal anaesthesia.