1. hydroxyl

noun. the monovalent group -OH in such compounds as bases and some acids and alcohols.

Rhymes with Hydroxyl Ion

• pion

Sentences with hydroxyl-ion

1. Noun Phrase
A pH above 7 indicates an excess of hydroxyl ions.

2. Noun Phrase
In contrast, a base is a substance that accepts hydrogen ions and produces negative hydroxyl ions in water.

2. ion

noun. ['ˈaɪˌɑːn, ˈaɪən'] a particle that is electrically charged (positive or negative); an atom or molecule or group that has lost or gained one or more electrons.