diff --git a/src/external/lib3ds-1.3.0/lib3ds/io.c b/src/external/lib3ds-1.3.0/lib3ds/io.c
index 43af688c1..1dfb0095b 100644
--- a/src/external/lib3ds-1.3.0/lib3ds/io.c
+++ b/src/external/lib3ds-1.3.0/lib3ds/io.c
@@ -25,7 +25,7 @@
 
 
 /*!
- * \defgroup io Binary Input/Ouput Abstraction Layer
+ * \defgroup io Binary Input/Output Abstraction Layer
  */
 
 typedef union { 
diff --git a/src/meshlabplugins/filter_screened_poisson/Src/PoissonRecon.cpp b/src/meshlabplugins/filter_screened_poisson/Src/PoissonRecon.cpp
index 13ff3eca5..033d7b388 100755
--- a/src/meshlabplugins/filter_screened_poisson/Src/PoissonRecon.cpp
+++ b/src/meshlabplugins/filter_screened_poisson/Src/PoissonRecon.cpp
@@ -190,9 +190,9 @@ void ShowUsage(char* ex)
 	printf( "Usage: %s\n" , ex );
 	printf( "\t --%s <input points>\n" , In.name );
 
-	printf( "\t[--%s <ouput triangle mesh>]\n" , Out.name );
+	printf( "\t[--%s <output triangle mesh>]\n" , Out.name );
 
-	printf( "\t[--%s <ouput voxel grid>]\n" , VoxelGrid.name );
+	printf( "\t[--%s <output voxel grid>]\n" , VoxelGrid.name );
 
 #ifndef FAST_COMPILE
 	printf( "\t[--%s <b-spline degree>=%d]\n" , Degree.name , Degree.value );
diff --git a/src/meshlabplugins/filter_screened_poisson/Src/SSDRecon.cpp b/src/meshlabplugins/filter_screened_poisson/Src/SSDRecon.cpp
index 3f109c364..b0f979391 100644
--- a/src/meshlabplugins/filter_screened_poisson/Src/SSDRecon.cpp
+++ b/src/meshlabplugins/filter_screened_poisson/Src/SSDRecon.cpp
@@ -191,9 +191,9 @@ void ShowUsage( char* ex )
 	printf( "Usage: %s\n" , ex );
 	printf( "\t --%s <input points>\n" , In.name );
 
-	printf( "\t[--%s <ouput triangle mesh>]\n" , Out.name );
+	printf( "\t[--%s <output triangle mesh>]\n" , Out.name );
 
-	printf( "\t[--%s <ouput voxel grid>]\n" , VoxelGrid.name );
+	printf( "\t[--%s <output voxel grid>]\n" , VoxelGrid.name );
 
 #ifndef FAST_COMPILE
 	printf( "\t[--%s <b-spline degree>=%d]\n" , Degree.name , Degree.value );
diff --git a/src/meshlabplugins/filter_screened_poisson/Src/SurfaceTrimmer.cpp b/src/meshlabplugins/filter_screened_poisson/Src/SurfaceTrimmer.cpp
index 62a8fee7e..b365dddbc 100755
--- a/src/meshlabplugins/filter_screened_poisson/Src/SurfaceTrimmer.cpp
+++ b/src/meshlabplugins/filter_screened_poisson/Src/SurfaceTrimmer.cpp
@@ -56,7 +56,7 @@ void ShowUsage( char* ex )
 	printf( "Usage: %s\n" , ex );
 	printf( "\t --%s <input polygon mesh>\n" , In.name );
 	printf( "\t[--%s <trimming value>]\n" , Trim.name );
-	printf( "\t[--%s <ouput polygon mesh>]\n" , Out.name );
+	printf( "\t[--%s <output polygon mesh>]\n" , Out.name );
 	printf( "\t[--%s <smoothing iterations>=%d]\n" , Smooth.name , Smooth.value );
 	printf( "\t[--%s <relative area of islands>=%f]\n" , IslandAreaRatio.name , IslandAreaRatio.value );
 	printf( "\t[--%s]\n" , PolygonMesh.name );
diff --git a/src/meshlabserver/meshlabserver.txt b/src/meshlabserver/meshlabserver.txt
index e3d3adec6..b0d0a9406 100644
--- a/src/meshlabserver/meshlabserver.txt
+++ b/src/meshlabserver/meshlabserver.txt
@@ -2,7 +2,7 @@ meshlabserver [logargs] [args]
   where logargs can be:
     -d filename             dump on a text file a list of all the
                             filtering functions
-    -l filename             log of the filters is ouput on a file
+    -l filename             log of the filters is output on a file
   where args can be:
     -p filename             meshlab project (.mlp) to be loaded
     -w filename [-x]        output meshlab project (.mlp) to be saved.
diff --git a/src/plugins_unsupported/filter_poisson/src/MultiGridOctest.cpp b/src/plugins_unsupported/filter_poisson/src/MultiGridOctest.cpp
index 72ef5ebff..f42f04ce0 100755
--- a/src/plugins_unsupported/filter_poisson/src/MultiGridOctest.cpp
+++ b/src/plugins_unsupported/filter_poisson/src/MultiGridOctest.cpp
@@ -50,7 +50,7 @@ void ShowUsage(char* ex)
 	printf("Usage: %s\n",ex);
 	printf("\t--in  <input points>\n");
 
-	printf("\t--out <ouput triangle mesh>\n");
+	printf("\t--out <output triangle mesh>\n");
 
 	printf("\t[--depth <maximum reconstruction depth>]\n");
 	printf("\t\t Running at depth d corresponds to solving on a 2^d x 2^d x 2^d\n");