SYZYGIES
Noun
syzygies
plural of syzygy
Source: Wiktionary
SYZYGY
Syz"y*gy, n.; pl. Syzygies. Etym: [L. syzygia a joining together,
conjunction, Gr. syzygie. See Yoke, n.]
1. (Astron.)
Definition: The point of an orbit, as of the moon or a planet, at which it
is in conjunction or opposition; -- commonly used in the plural.
2. (Gr. & L. Pros.)
Definition: The coupling together of different feet; as, in Greek verse, an
iambic syzygy.
3. (Zoöl.)
(a) Any one of the segments of an arm of a crinoid composed of two
joints so closely united that the line of union is obliterated on the
outer, though visible on the inner, side.
(b) The immovable union of two joints of a crinoidal arm. Line of
syzygies (Astron.), the straight line connecting the earth, the sun,
and the moon or a planet, when the latter is in conjunction or
opposition; -- used chiefly of the moon.
Source: Webster’s Unabridged Dictionary 1913 Edition