1. Sour and sharp to the taste.

2. A sour substance; a substance capable of uniting with salifiable bases and forming salts.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• accit,
• acked,
• aaid,
• adiu,
• baced,
• asci,
• aciden,
• haced,
• acard,
• aboid,
• acis,
• asied,
• ahnd,
• acion,
• asfd,
• actir,
• facied,
• arvid,
• asif,
• ucsd

• accede,
• acth,
• acadia,
• acuity,
• acedia,
• Acedo,
• Aceuedo,
• act.

The adverb form of the word "acid" is "acidly".

The adjective form of the word "acid" is "acidic".

The plural of the "acid" can be the "acids".

The singular of the "acid" can be the "acid".