bane

Short definition from Wiktionary

Noun

1. 1
   A cause of misery or ruin.
2. 2
   Chiefly in the names of poisonous plants or substances: a poison.
3. 3
   Misery, woe; also, doom, ruin; or physical injury, harm.
4. 4
   A disease of sheep in which breakdown of tissue occurs; rot.
5. 5
   A person or thing that causes death or destruction; a killer, a murderer, a slayer.
6. 6
   Death; destruction; (countable) an instance of this.
7. 7
   Alternative spelling of bone.

Verb

1. 1
   To physically injure (someone or something); to harm, to hurt.
2. 2
   To cause (someone) misery or ruin; to socially or spiritually injure (someone).
3. 3
   To cause (sheep) a disease, especially the rot (“a disease in which breakdown of tissue occurs”).
4. 4
   To kill (a person or animal), especially by poison.

Proper noun

1. 1
   A surname.