One of the mysteries of the English language finally explained.
1Anatomy and Zoology. Designating the two pairs of protuberances (the inferior and superior colliculi) of the tectum of the midbrain in mammals; of, relating to, or designating this region of the brain.
2Medicine. Designating or relating to any form of cardiac arrhythmia in which heartbeats (normal or abnormal) occur in groups of four.
Late 17th century (in an earlier sense). From classical Latin quadrigeminus fourfold, in post-classical and scientific Latin also designating a muscle, designating the quadrigeminal bodies, the quadrigeminal tubercles, and the quadrigeminal protuberances, and designating a pulse + -al.
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