nChorisis(Bot) The separation of a leaf or floral organ into two more parts.☞ In collateral chorisis the parts are side by side. -- In parallel or median chorisis they are one in front of another.
Century Dictionary and Cyclopedia
nchorisisIn botany, the multiplication, by congenital division, of an organ which is ordinarily entire. It is usually restricted to the stamens and carpels of the flower, and may be either collateral, when the parts are side by side, as in the stamens of Dicentra, or, more rarely, transverse. Also called chorization.
nchorisisIn geometry, a number associated with a place which indicates how many different places it contains, such that a particle could not by an ordinary motion within it pass from one to another. A place which is continuously connected throughout is of chorisis 1, and in general the number of the chorisis is the number of separate places in which there is room for particles. The chorisis of all space is, of course, 1.
Webster's Revised Unabridged Dictionary
NL., fr. Gr. separation
Most of these cases of polyphylly affecting the calyx may be explained by lateral chorisis or fission.