# ampicillin

> English word · Noun · IPA /ˌæm.pɪˈsɪl.ɪn/ · frequency rank #70,452

## Definitions
1. A semisynthetic form of penicillin C₁₆H₁₉N₃O₄S that is effective against gram-negative and gram-positive bacteria and is used to treat infections of the urinary, respiratory, and intestinal tracts.

## Etymology
From am(ino)- + p(en)icillin.

## Source
Compiled from Wiktionary via kaikki.org (CC BY-SA). Data vintage: 2026-05-06.
Canonical page: https://plainspell.com/en/word/ampicillin