Definitions

1. noun

a prefix used to form nouns indicating an object or instrument, as in ‘oblong’ or ‘oboe’

“The oblong shape of the room made it difficult to fit the furniture.”

2. prefix

used to form nouns and verbs indicating an object, instrument, or action, as in ‘obey’ or ‘obscure’

“The verb ‘obfuscate’ means to make something unclear or difficult to understand.”