The period of geologic time between 4.6 and 3.8 billion years ago, when the solar system was forming and the Earth was solidifying. No rocks are known from this time, as they were presumably eroded or drawn deep into the Earth and melted through the processes of plate tectonics. See Chart at geologic time.
[heyd] /heɪd/ noun 1. Geology. the angle between a fault plane and the vertical, measured perpendicular to the strike of the fault; complement of the dip. 2. Mining. the inclination of a vein or seam from the vertical. verb (used without object), haded, hading. 3. (of a fault, vein, or seam) to incline from a […]
/ˈhɑːdɪˌdɑː/ noun 1. (South African) a large greyish-green ibis, Hagedeshia hagedash, having a greenish metallic sheen on the wing coverts and shoulders
/ˈheɪdən/ noun 1. Charles (Edward). born 1937, US jazz bassist, esp. noted for his collaborations with Ornette Coleman and Keith Jarrett
- Had enough
see: have had enough