the addition of an ingredient for the purpose of enrichment (as the addition of alcohol to wine or the addition of vitamins to food) | a fortification of earth; mostly or entirely below ground |
defensive structure consisting of walls or mounds built around a stronghold to strengthen it | either of two low shelters on either side of a baseball diamond where the players and coaches sit during the game |
the art or science of strengthening defenses | a canoe made by hollowing out and shaping a large log |
| a shelter for humans or domesticated animals and livestock based on a hole or depression dug into the ground; can be fully recessed into the earth, with a flat roof covered by ground, semi-recessed, with a constructed wood or sod roof standing out, or dug into a hillside. |