## Etymology
From strengthen + -er, agent/instrument noun. Strengthen derives from Old English strengþu ('strength'), from strang ('strong'), from Proto-Germanic *strangiþō.

## AI Etymology
Strengthener is from strengthen + -er, agent/instrument noun. Strengthen derives from Old English strengþu ('strength'), from strang ('strong'), from Proto-Germanic *strangiþō. Important recorded forms include strengþu (Old English) and *strangiþō (Proto-Germanic). Morphologically, the word preserves a built structure whose named elements carry the historical sense into English. The modern sense continues the older lexical line without requiring a separate origin. In current use it covers a thing that strengthens or reinforces something. The wider family includes related words such as strengthen, strength, and strong.

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- People & Society
- Word Formation & Derivatives

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