| arch | the time prior to 2,500 million years ago |
|---|---|
| arch | (architecture) forming or resembling an arch |
| arch | constructed with or in the form of an arch or arches |
| arch | (botany) of or relating to an archegonium |
| arch | (botany) of or relating to an archegonium |
| arch | a female sex organ occurring in mosses, ferns, and most gymnosperms |
| arch | central cavity of the gastrula |
| arch | considered ancient life forms that evolved separately from bacteria and blue-green algae |
| arch | related to or dealing with or devoted to archaeology |
| arch | related to or dealing with or devoted to archaeology |
| arch | a relic that has been excavated from the soil |
| arch | an anthropologist who studies prehistoric people and their culture |