Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • adj. subdivided into many parts
  • adj. Describing a variable that has multiple (more than two) categories

from the GNU version of the Collaborative International Dictionary of English

  • adj. Subdivided into many distinct subordinate parts, which, however, not being jointed to the petiole, are not true leaflets; -- said of leaves.

from The Century Dictionary and Cyclopedia

  • In botany, subdivided into many distinct subordinate parts, which, however, not being jointed to the petiole, are not true leaflets: said of leaves.
  • Dividing once or repeatedly into sets of three or more branches: opposed to dichotomous.

Etymologies

poly- + -tomous (Wiktionary)

Examples

  • The lack of resolution in more terminal internal nodes is common in studies using phylogenetic supertrees, but these studies also tend to have polytomous nodes basally as well

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  • The comparative biology literature on this topic is deeper, focusing on developing methods to deal with soft polytomies by representing the branch lengths between the lineages derived from a polytomous node as a zero

    PLoS ONE Alerts: New Articles

  • The above results show that when large phylogenies are used containing polytomous nodes basally in the tree the researcher may expect to have substantially reduced statistical power to detect non-random phylogenetic community structure.

    PLoS ONE Alerts: New Articles

  • (CIs) in the middle and low titer groups were calculated using a polytomous logistic regression model, with the high titer group considered as control.

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