| phyle | Origin: NL, fr. Gr. A body of men united by ties of blood or habitation. A local division of the people in ancient Athens; a clan; a tribe. Source: Websters Dictionary (01 Mar 1998) |
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| phyletic | Denoting the evolution of sequential changes in a line of descent by which one species is transformed into a new species. Origin: G. Phyletikos, tribal, fr. Phyle, a tribe (05 Mar 2000) |
| phyletic shift | <ecology> A measurable change over time in a population which can be physical, morphologic, genetic, and/or behavioural. (09 Oct 1997) |