DICHOTOMY

n. pi-koH'om-i2. Gr., Sixoropia. Lat, dicJiotomia. Fr., dichotomic. Ger., Dichotomic, Zweitheilung. The state of being dichotomous, the phenomenon of dichotomous division. Anterior d. A form of double monstrosity in which the two individuals are fused below the upper limbs. Bifurcate d. See BIFURCATION. Bostrychoid d. See Helicoid sympodial d. Cicinal d. A d. in which at each bifurcation one branch develops more strongly than the other, as in the shoots of Selaginella. [B, 291 (a, 24).] False d. Lat, dichotomia spuria. A d. in which the lateral branches develop in such a manner as to resemble true forks, or a genuine d. It is always seen on plants, with alternate. not opposite leaves. [B, 121, 291 (a, 24).] Forked d. A d. in which the branches develop equally. [B, 291 (a, 24) ] Helicoid sympodial d. A d. in which the branch on one side is suppre ed, or only slightly developed. [B. 291 (a, 24).] Posterior d. A form of double monstrosity in which the two individuals are fused above the lower limbs. [S. Deakin, "Brit. Med. Jour.," Dec. 12, 1885, p. 1104.J Scorpioid d. A d. in which a branch is suppre ed, or but partially developed, first on one side and then on the other. [B, 291 (a, 24).] Sympodial d. A d. in which only one of the secondary axes develops decidedly, and an apparent primary shoot, consisting really or single branches of consecutive for kings, is produced. [B, 291 (a, 24).] Tnie d. Lat., dichotomia vera. A d. in which the two branches of the forking are of the same generation and which take place by the repeated division of the apex of the organ into two equal portions. [B, 104, 121, 291 (a, 24).] [s. 562]