(1):
(n.) The intimately united and apparently fused condition of certain low organisms during conjugation.
(2):
(n.) The coupling together of different feet; as, in Greek verse, an iambic syzygy.
(3):
(n.) 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.
(4):
(n.) 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.
(5):
(n.) The immovable union of two joints of a crinoidal arm.