simple past tense and past participle of strengthen

(transitive) To make strong or stronger; to add strength to; to increase the strength of; to fortify. / (transitive) To empower; to give moral strength to; to encourage; to enhearten.

present participle of strengthen

The process by which something is strengthened.

Third-person singular simple present indicative form of strengthen

One who, or that which, gives or adds strength.

plural of strengthener

plural of strengthening

Capable of being strengthened.

(medicine, archaic) A plaster containing iron, supposed to have tonic effects.