from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun Pressure lower than a given reference pressure, generally causing suction rather than exerting an outward pushing force.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun Pressure that is less than normal
- noun The
tensionin a liquidthat is thermodynamically metastablewith respect to the vapour phase; especially that in the xylemof vascular plantsthat allows transpirationto great heights
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