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Webster 1913 Edition

Adj.

That strengthens; giving or increasing strength.

–

Strength′en-ing-ly

adv.

Strengthening plaster

(Med.)

a plaster containing iron, and supposed to have tonic effects.

ppr.

Increasing strength, physical or moral; confirming; animating.

strengthening

strengthening ‎(plural strengthenings)

that to strengthen