Astringent (adjective)

1. Having a tightening effect on living tissue; tending to draw together or constrict tissue.
2. Sour or bitter in taste or tone; sharp or severe in nature or effect.

Origin:

From the latin word 'astringere' meaning 'to bind fast'.

Examples:

1. The astringent toner helped to shrink the size of my pores.
2. Her astringent remarks about the company's policies left a bitter taste in everyone's mouth.
3. The astringent lemon juice had a sharp, tangy flavor that was both sour and bitter.
4. His astringent criticism of her performance was harsh and unwarranted.
5. The astringent tea was bitter and strong, making it a good choice for those who enjoy bold flavors.