| 释义 |
polytomous, a.|pəˈlɪtəməs|
[f. Gr. type *πολύτοµ-ος (f. πολυ- much + -τοµος cut) + -ous.]
Divided, or involving division, into many parts.
1. Bot.
a. spec. Applied to a leaf having several divisions, but not articulated with the midrib so as to form leaflets (e.g., a pinnatifid or pinnatipartite leaf).
b. Applied to branching in which the axis divides into more than two secondary axes at the same point.
1858Mayne Expos. Lex., Polytomus, Bot., applied by L. C. Richard to leaves the median nervure of which, not the foliaceous part, is combined with the common petiole, but without articulation, which distinguishes them from compound leaves: polytomous. 1866Treas. Bot. 917 Polytomous, pinnate, but without having the divisions articulated with the common petiole.
2. Logic. Involving polytomy: see next, 2. Distinguished from dichotomous and trichotomous. |