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Webster's 1828 Dictionary

STIFFENING

ppr. Making or becoming less pliable, or more thick, or more obstinate.

STIFFENING

n.Something that is used to make a substance more stiff or less soft.

Webster's 1913 Dictionary

STIFFENING

STIFFENING Stiff "en *ing, n.

1. Act or process of making stiff.

2. Something used to make anything stiff. Stiffening order (Com. ), a permission granted by the customs department to take cargo or ballast on board before the old cargo is out, in order to steady the ship.

New American Oxford Dictionary

stiffening

stiff en ing |ˈstif (ə )niNG ˈstɪfənɪŋ | ▶noun material used to stiffen a garment, fabric, or other object.

Oxford Dictionary

stiffening

stiff ¦en |ing |ˈstɪfnɪŋ | ▶noun [ mass noun ] material used to stiffen a garment, fabric, or other object.

Sanseido Wisdom Dictionary

stiffening

st í ff en ing 名詞 U (stiffenerの )芯（しん）材 .