| strengthen | To grow strong or stronger. "The young disease, that must subdue at length, Grows with his growth, and strengthens with his strength." (Pope) Source: Websters Dictionary (01 Mar 1998) |
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| strengthening | That strengthens; giving or increasing strength. <medicine> Strength"eningly, Strengthening plaster, a plaster containing iron, and supposed to have tonic effects. Source: Websters Dictionary (01 Mar 1998) |