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basal

[ˈbeɪsəɫ] [ˈbeɪzəɫ]
Visual illustration of basal: In a phylogenetic tree, being a group, or member of a group, which diverged earlier. The earliest clade to branch in a larger clade.
adjective

In a phylogenetic tree, being a group, or member of a group, which diverged earlier. The earliest clade to branch in a larger clade.