Onychotillomania
onychotillomania on·y·chot·il·lo·ma·ni·a (ŏn’ĭ-kŏt’l-ō-mā’nē-ə, -mān’yə, ŏn’ĭ-kō-tĭl’ə-)
n.
A tendency to pick at the fingernails or toenails.
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- Onychotomy  onychotomy on·y·chot·o·my (ŏn’ĭ-kŏt’ə-mē) n. Incision into a toenail or fingernail. 
- Onym  1. a combining form of Greek origin, meaning “word,” “name”: pseudonym. combining form 1. indicating a name or word: acronym, pseudonym 
- Onymous  /ˈɒnɪməs/ adjective 1. (of a book) bearing its author’s name adj. 1775, coined to provide an opposite to anonymous. Related: Onymously. 
- On your life  see: not on your life 
- Onyx  [on-iks, oh-niks] /ˈɒn ɪks, ˈoʊ nɪks/ noun 1. Mineralogy. a variety of chalcedony having straight parallel bands of alternating colors. Compare . 2. (not used technically) an unbanded chalcedony dyed for ornamental purposes. 3. black, especially a pure or jet black. 4. Medicine/Medical. a nail of a finger or toe. adjective 5. black, especially jet […] 
