from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The boundary between the earth's crust and the underlying mantle, averaging 8 kilometers (5 miles) in depth under the oceans and 32 kilometers (20 miles) in depth under the continents.


After Andrija Mohorovičić (1857-1936), Croatian geophysicist.
(American Heritage® Dictionary of the English Language, Fourth Edition)


  • “Although most countries play down the power of their lasers to blind on the battlefield, China, for one, has made no pretense of this potential use of its 73-pound, battery-powered ZM-87 Portable Laser Disturber.”

    The Volokh Conspiracy » Acquiring UAV Technology

  • The 73-pound bike sports a 500-watt motor capable of cruising at 20mph on flat terrain.

    A2B electric bike is a smooth, green ride

  • Now 43 and half blind, Bun clings weakly to the dirty sheets of his bed in a Phnom Penh AIDS hospice, his 73-pound body a skeleton of his former self.

    The Parent Killer

  • We did some fishing there, and I caught a 73-pound peixe de couro, or pintado, a member of the catfish family pictured.

    Jungle Fever

  • The 2. 73-pound Samsung N150 features include seven-hour battery life, Intel Atom N450 1.66 New Blogs and RSS Feeds

  • Some of the more notable records include Mark Broadway's 12. 73-pound largemouth bass that he caught at Lake Arrowhead in March 2008.

    Times Record News Stories

  • Florida Keys residents and visitors have been given a public invitation to join in the release of the 73-pound turtle, at 9: 20 a.m. Sunday at Veteran's Park on Little Duck Key, Mile Marker 40. -

  • The 73-pound Martian explorer was conceived by Dr. Colin T. Pillinger of the Open University in Milton Keynes, England.

    In search of life on Mars

Wordnik is becoming a not-for-profit! Read our announcement here.


Log in or sign up to get involved in the conversation. It's quick and easy.