in·cer·tae se·dis \iŋ|kerˌtīˈsādə̇s, inˌsərd.ēˈsēdə̇s\adverb Etymology: Latin, of uncertain place : in an uncertain position : without assurance of relationship — used of taxa < the Acanthocephala have often been placed incertae sedis among the Nemathelminthes >