diff --git a/src/g_game.cpp b/src/g_game.cpp
index 10b4ee4c0..da11adf1d 100644
--- a/src/g_game.cpp
+++ b/src/g_game.cpp
@@ -3132,3 +3132,4 @@ DEFINE_GLOBAL(automapactive);
 DEFINE_GLOBAL(Net_Arbitrator);
 DEFINE_GLOBAL(netgame);
 DEFINE_GLOBAL(paused);
+DEFINE_GLOBAL(Terrains);
diff --git a/src/gamedata/r_defs.h b/src/gamedata/r_defs.h
index 2aa79a1fd..d233e09e0 100644
--- a/src/gamedata/r_defs.h
+++ b/src/gamedata/r_defs.h
@@ -1771,7 +1771,6 @@ void GetSpecial(sector_t *self, secspecial_t *spec);
 void SetSpecial(sector_t *self, const secspecial_t *spec);
 int GetTerrain(const sector_t *, int pos);
 FTerrainDef *GetFloorTerrain_S(const sector_t* sec, int pos);
-FTerrainDef *GetTerrainDef(const unsigned int num);
 void CheckPortalPlane(sector_t *sector, int plane);
 void AdjustFloorClip(const sector_t *sector);
 void SetColor(sector_t *sector, int color, int desat);
diff --git a/src/playsim/p_sectors.cpp b/src/playsim/p_sectors.cpp
index e3963272b..bc31156a6 100644
--- a/src/playsim/p_sectors.cpp
+++ b/src/playsim/p_sectors.cpp
@@ -943,12 +943,7 @@ FTerrainDef *GetFloorTerrain_S(const sector_t* sec, int pos)
 	return &Terrains[GetTerrain(sec, pos)];
 }
 
-FTerrainDef *GetTerrainDef(const unsigned int num)
-{
-	return (num >= 0 && num < Terrains.Size()) ? &Terrains[num] : nullptr;
-}
-
-	//=====================================================================================
+//=====================================================================================
 //
 //
 //=====================================================================================
diff --git a/src/scripting/vmthunks.cpp b/src/scripting/vmthunks.cpp
index e35dd43bf..11bee9835 100644
--- a/src/scripting/vmthunks.cpp
+++ b/src/scripting/vmthunks.cpp
@@ -477,13 +477,6 @@ DEFINE_ACTION_FUNCTION_NATIVE(_Sector, GetFloorTerrain, GetFloorTerrain_S)
 	ACTION_RETURN_POINTER(GetFloorTerrain_S(self, pos));
 }
 
-DEFINE_ACTION_FUNCTION_NATIVE(_Sector, GetTerrainDef, GetTerrainDef)
-{
-	PARAM_SELF_STRUCT_PROLOGUE(sector_t);
-	PARAM_UINT(floorterrain);
-	ACTION_RETURN_POINTER(GetTerrainDef(floorterrain));
-}
-
 DEFINE_ACTION_FUNCTION_NATIVE(_Sector, CheckPortalPlane, CheckPortalPlane)
 {
 	PARAM_SELF_STRUCT_PROLOGUE(sector_t);
diff --git a/wadsrc/static/zscript/doombase.zs b/wadsrc/static/zscript/doombase.zs
index 1670e3b95..34a00cdd4 100644
--- a/wadsrc/static/zscript/doombase.zs
+++ b/wadsrc/static/zscript/doombase.zs
@@ -5,6 +5,7 @@ extend struct _
 	native readonly Array<@PlayerClass> PlayerClasses;
 	native readonly Array<@PlayerSkin> PlayerSkins;
 	native readonly Array<@Team> Teams;
+	native readonly Array<@TerrainDef> Terrains;
 	native int validcount;
 	native play @DehInfo deh;
 	native readonly bool automapactive;
diff --git a/wadsrc/static/zscript/mapdata.zs b/wadsrc/static/zscript/mapdata.zs
index 8b296d994..01bf62b05 100644
--- a/wadsrc/static/zscript/mapdata.zs
+++ b/wadsrc/static/zscript/mapdata.zs
@@ -452,7 +452,6 @@ struct Sector native play
 	native void GetSpecial(out SecSpecial spec);
 	native void SetSpecial( SecSpecial spec);
 	native int GetTerrain(int pos);
-	native TerrainDef GetTerrainDef(uint floorterrain);	// Gets the terraindef from the number (such as an actor's floorterrain). May return null!
 	native TerrainDef GetFloorTerrain(int pos);			// Gets the terraindef from floor/ceiling (see EPlane const).
 	native void CheckPortalPlane(int plane);
 	native double, Sector HighestCeilingAt(Vector2 a);