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

Lexicographical Neighbors of Ob-

oathbreaking
oathed
oathing
oathlike
oaths
oatlage
oatlike
oatmeal
oatmeal-tomato paste agar
oatmeal cookie
oatmeal drink
oatmeals
oats
oaty
oaves
ob- (current term)
oba
obambulate
obambulation
obambulations
obang
obangs
obas
obb
obbligati
obbligato
obbligatos
obcompressed
obconic
obconical

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