Syzygy

Item #7 on Colleen's Thursday Thirteen today says, "Do you know what the longest English word that does not use any of the standard vowels: a, e, i, o, or u, is?"  At the end, Colleen told us the answer is "rhythm."  I commented:

My answer to #7 is syzygy, which is exactly as long as rhythm. I really like the word syzygy, which is a term Carl Jung used to mean “a union of opposites.”

Colleen came back with this comment:

That’s a new one one me (and an inspiration for Scrabble playing).  Thanks, Bonnie.

Definition of SYZYGY

1. (Astronomy) either of the two positions (conjunction or opposition) of a celestial body when sun, earth, and the body lie in a straight line the moon is at syzygy when full
2. (Literature / Poetry) (in classical prosody) a metrical unit of two feet
3. Rare any pair, usually of opposites
4. (Life Sciences and Allied Applications / Zoology) Biology the aggregation in a mass of certain protozoans, esp when occurring before sexual reproduction