1 Her birth was of the womb of morning dew, 2 And her conception of the joyous prime,
prime > sunrise; springtime
3 And all her whole creation did her show
show > [show to be, prove to be]
4 Pure and unspotted from all loathly crime,
unspotted from > innocent of loathly > loathsome crime > {Wrongdoing; sins taken collectively}
5 That is ingenerate in fleshly slime.
ingenerate > inborn; engendered fleshly slime > [human flesh; "slime" = "clay": cf. e.g. 209.21:5]
6 So was this virgin born, so was she bred,
So > Thus, in this manner