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Definition of Ob-
1. Prefix. (context: non-productive) Against; facing; a combining prefix found in verbs of Latin origin. ¹
2. Prefix. (botany) Of a reversed shape. ¹
3. Prefix. (Internet informal) Obligatory; prepended to the name of a topic being mentioned to avoid accusations of being off-topic. ¹
¹ Source: wiktionary.com