rancid

Definition of Rancid in English :

1. rancid

(used of decomposing oils or fats) having a rank smell or taste usually due to a chemical change or decomposition

Example Sentences:
'rancid butter'
'rancid bacon'

2. rancid, sour

smelling of fermentation or staleness

WordNet Lexical Database for English. Princeton University. 2010.

Rancid

adjective

1.

(of butter, bacon, etc) having an unpleasant stale taste or smell as the result of decomposition

2.

(of a taste or smell) rank or sour; stale

adjective

1.

having the bad smell or taste of stale fats or oils; spoiled

2.

repugnant

adj.

1. Having the disagreeable odor or taste of decomposing oils or fats; rank.

2. Repugnant; nasty: rancid remarks.