also: おにっこ
noun
child born with teeth
Traditional term for a baby born with teeth already erupted, sometimes considered an ill omen in folklore.
昔話では、鬼子は生まれつき歯が生えていると恐れられた。
In old tales, a child born with teeth was feared as an onigo.
鬼子は親に似ぬ子を指す古い言葉だ。
Onigo is an old word for a child who does not resemble its parents.
noun
wild child; badly-behaved child
Used for a child who is unruly, mischievous, or difficult to control. Can be used figuratively.
あの子は近所で有名な鬼子だ。
That kid is known around the neighborhood as a little terror.
Alternate spelling with small っ, more clearly indicating the reading おにっこ.
Compound of 鬼 (oni, 'demon, ogre') and 子 (ko, 'child'). The exact historical derivation is uncertain, but the word has been used since at least the Edo period to refer to unusual or difficult children.