Biol. [mod.L., ad. Gr. ζύγωσις, f. ζυγοῦν to yoke, f. ζυγόν yoke.] = CONJUGATION 5.

1

1880.  Pascoe, Zool. Chem. (ed. 2), 297.

2

1882.  Saville-Kent, Man. Infusoria, 874.

3