Children's, Intermediate and Advanced Online English Dictionary & Thesaurus

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surface tension the force at the surface of a liquid that tends to cause contraction and thus makes the surface somewhat like a tightly stretched membrane.
surface-active designating a substance that is capable of reducing the surface tension of a liquid to which it is added.
surface-to-air of or denoting a missile or the like that is launched from the ground toward a target or destination in the air.
surface-to-surface of or denoting a missile or the like that is launched from the ground and travels through the air to a target or destination on land.