D defs.my
Entry 2 senses Webster, 1913

Thereto

/thĕr'-to͞oˌ/ · There·to · IPA /ˌðɛɚˈtuː/
01 adv. To that or this.
  1. 1.
    To that or this.
  2. 2.
    Besides; moreover.[Obs.]
    “Her mouth full small, and thereto soft and red.” Chaucer.