A noun

• A non-closed body which is not solid or filled. i.e. contains empty space or air.
  • Hollow Earth
    Hollow Earth
    The Hollow Earth hypothesis proposes that the planet Earth is either entirely hollow or otherwise contains a substantial interior space. The hypothesis has been shown to be wrong by observational evidence, as well as by the modern understanding of planet formation; the scientific community has...
    
     theory, the idea that the planet Earth has a hollow interior and possibly an inhabitable inner surface.
  • Tree hollow
    Tree hollow
    A tree hollow or tree hole is a semi-enclosed cavity which has naturally formed in the trunk or branch of a tree. These are predominantly found in old trees, whether living or not...
    
    , a hollow in a branch or trunk, which may provide habitat for animals.

• A depression in a surface or the ground.
  • A low, wooded area, such as a copse
  • A term meaning a small vee-shaped riverine type of valley with moderately sloped sides pitched more gently than and both broader and larger than a ravine
    Ravine
    A ravine is a landform narrower than a canyon and is often the product of streamcutting erosion. Ravines are typically classified as larger in scale than gullies, although smaller than valleys. A ravine is generally a fluvial slope landform of relatively steep sides, on the order of twenty to...
    
    . The term is used primarily within and in the states bordering Appalachia
    Appalachia
    Appalachia is a term used to describe a cultural region in the eastern United States that stretches from the Southern Tier of New York state to northern Alabama, Mississippi, and Georgia. While the Appalachian Mountains stretch from Belle Isle in Canada to Cheaha Mountain in the U.S...
    
     (The Appalachian Mountains
    Appalachian Mountains
    The Appalachian Mountains #Whether the stressed vowel is or ,#Whether the "ch" is pronounced as a fricative or an affricate , and#Whether the final vowel is the monophthong or the diphthong .), often called the Appalachians, are a system of mountains in eastern North America. The Appalachians...
    
    , from New England
    New England
    New England is a region in the northeastern corner of the United States consisting of the six states of Maine, New Hampshire, Vermont, Massachusetts, Rhode Island, and Connecticut...
    
     to Mississippi
    Mississippi
    Mississippi is a U.S. state located in the Southern United States. Jackson is the state capital and largest city. The name of the state derives from the Mississippi River, which flows along its western boundary, whose name comes from the Ojibwe word misi-ziibi...
    
    ) where some local glaciation has broadened ravines into a wider form. Frequently pronounced "Holler" in the central and southern Appalachia states.

• Hollow-point bullets

Fiction and media

• The Hollow
  The Hollow
  The Hollow is a work of detective fiction by Agatha Christie and first published in the US by Dodd, Mead and Company in 1946 and in the UK by the Collins Crime Club in November of the same year. The US edition retailed at $2.50 and the UK edition at eight shillings and sixpence...
  
  , a 1946 detective novel by Agatha Christie
• The Hollow (2004 film)
  The Hollow (2004 film)
  The Hollow is a 2004 teen horror movie, starring Kevin Zegers, Kaley Cuoco, Nick Carter and Stacy Keach. The movie premiered on the ABC Family Channel in October 2004. It tells the story of Ian Cranston , a high school teen who just found out he's the descendant of Ichabod Crane...
  
  , a 2004 teen horror film
• Hollow (2009 film)
  Hollow (2009 film)
  Hollow is a 2009 American film starring Stephen Schmaltz, Catrina Fagundes and Peter Wayne Burke and marks the debut of director Chris Corey in feature length work.-Synopsis:...
  
  , a 2009 American film by Chris Corey
• Hollow (Charmed)
  Hollow (Charmed)
  The Hollow is a fictional entity created by Brad Kern for the American television series, Charmed. It first appears in the fourth season of the supernatural drama and is used again in the last two episodes of the series in its eighth season...
  
  , a fictional entity in the television series Charmed
• Hollow (Marvel Comics), a mutant formerly known as Penance
• Hollows, fictional beings in the manga and anime series Bleach, see List of Hollows in Bleach

Music

• "Hollow" from Infernal (album) by Edge Of Sanity
• "Hollow" (song)
  Hollow (song)
  "Hollow" is a song by the heavy metal group Pantera from the 1992 album Vulgar Display of Power. A live medley of "Hollow" and another Pantera song, "Domination", is featured on Official Live: 101 Proof as "Dom/Hollow".-Lyrics:...
  
   by Pantera
• "The Hollow" (song)
  The Hollow (song)
  "The Hollow" is a single from A Perfect Circle's 2000 album Mer de Noms. It serves as the opening track of the album, utilizing layered guitars...
  
  , a song by A Perfect Circle