zygon

noun2

1. •
   An affinity or connection in a piece of music between tones, chords, or phrases, such that one part appears to repeat, to imitate, or to derive from the other, especially when perceived as an organising principle in the music; a zygonic relationship.

   • Zygonic relationships, or zygons, are depicted using the letter Z. — 2006
2. •
   In the cerebrum, a short crossbar fissure that connects the two pairs of branches of a larger zygal (H-shaped) fissure.

   • “The evidence is threefold: (1) as admitted by Ecker, the zygon always appears independently in the foetus — 1896