tohua - marked (tohu + passive suffix -a)
tōhua - yolk
Tohua, tōuda. 1. n. Yolk of an egg.
2. Roe of fish.
3. a. Full, of the moon. Ko te marama ka tohua.
whakathua, v.i. Grow, as a foetus. Ka tu ki te whakatohuatanga mai i Hawaiki (M. 353).
‖ hua (i).
Williams Dictionary
Āta wāhia te hēki, kei pakaru mai te tōhua.Crack the egg open slowly/with care, or you might break the yolk.