脊せき髄ずい反はん射しゃ

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Meanings

1

spinal reflex

Medical/physiological term for an involuntary response mediated by the spinal cord. Also used figuratively for an immediate, unthinking reaction.

脊せき髄ずい反はん射しゃは、脳のうを介かいさずに起おこる反はん応のうです。
A spinal reflex is a response that occurs without going through the brain.
彼かれの返へん事じは脊せき髄ずい反はん射しゃのようなものだった。
His reply was like a spinal reflex—immediate and unthinking.