diff --git a/src/string_with_vars.ml b/src/string_with_vars.ml
index ee28cb0e..04aa239f 100644
--- a/src/string_with_vars.ml
+++ b/src/string_with_vars.ml
@@ -196,20 +196,20 @@ module Var = struct
   let loc (t : t) = t.loc
 
   type kind =
-    | Single of string
-    | Pair of string * string
+    | Var of string
+    | Macro of string * string
 
   let destruct { loc = _ ; name; payload; syntax = _ } =
     match payload with
-    | None -> Single name
-    | Some p -> Pair (name, p)
+    | None -> Var name
+    | Some p -> Macro (name, p)
 
   let name { name; _ } = name
 
   let full_name t =
     match destruct t with
-    | Single s -> s
-    | Pair (k, v) -> k ^ ":" ^ v
+    | Var s -> s
+    | Macro (k, v) -> k ^ ":" ^ v
 
   let to_string = string_of_var
 
@@ -223,7 +223,7 @@ module Var = struct
   let with_name t ~name =
     { t with name }
 
-  let is_form t = Option.is_some t.payload
+  let is_macro t = Option.is_some t.payload
 end
 
 let partial_expand
@@ -278,8 +278,8 @@ let expand t ~mode ~dir ~f =
         begin match var.syntax with
         | Percent ->
           begin match Var.destruct var with
-          | Single v -> Loc.fail var.loc "unknown variable %S" v
-          | Pair _ -> Loc.fail var.loc "unknown form %s" (string_of_var var)
+          | Var v -> Loc.fail var.loc "unknown variable %S" v
+          | Macro _ -> Loc.fail var.loc "unknown form %s" (string_of_var var)
           end
         | Dollar_brace
         | Dollar_paren -> Some [Value.String (string_of_var var)]
diff --git a/src/string_with_vars.mli b/src/string_with_vars.mli
index cfd39633..ddb09575 100644
--- a/src/string_with_vars.mli
+++ b/src/string_with_vars.mli
@@ -58,8 +58,8 @@ module Var : sig
   val full_name : t -> string
 
   type kind =
-    | Single of string
-    | Pair of string * string
+    | Var of string
+    | Macro of string * string
 
   val destruct : t -> kind
 
@@ -69,7 +69,7 @@ module Var : sig
 
   val with_payload : t -> payload:string option -> t
 
-  val is_form : t -> bool
+  val is_macro : t -> bool
 end
 
 val expand
diff --git a/src/super_context.ml b/src/super_context.ml
index 6c59e708..4d3f69e4 100644
--- a/src/super_context.ml
+++ b/src/super_context.ml
@@ -46,7 +46,7 @@ type t =
   ; stanzas_to_consider_for_install  : Installable.t list
   ; cxx_flags                        : string list
   ; vars                             : Var.Kind.t Var.Map.t
-  ; forms                            : Var.Form.t Var.Map.t
+  ; macros                           : Var.Macro.t Var.Map.t
   ; chdir                            : (Action.t, Action.t) Build.t
   ; host                             : t option
   ; libs_by_package : (Package.t * Lib.Set.t) Package.Name.Map.t
@@ -86,17 +86,17 @@ let find_scope_by_dir  t dir  = Scope.DB.find_by_dir  t.scopes dir
 let find_scope_by_name t name = Scope.DB.find_by_name t.scopes name
 
 let expand_vars t ~syntax_version ~var : Var.Kind.t option =
-  if String_with_vars.Var.is_form var then
-    Exn.code_error "expand_vars can't expand forms"
+  if String_with_vars.Var.is_macro var then
+    Exn.code_error "expand_vars can't expand macros"
       [ "var", String_with_vars.Var.sexp_of_t var ]
   else
     Var.Map.expand t.vars ~syntax_version ~var
 
-let expand_form t ~syntax_version ~var =
-  if String_with_vars.Var.is_form var then
-    Var.Map.expand t.forms ~syntax_version ~var
+let expand_macro t ~syntax_version ~var =
+  if String_with_vars.Var.is_macro var then
+    Var.Map.expand t.macros ~syntax_version ~var
   else
-    Exn.code_error "expand_vars can't expand single variables"
+    Exn.code_error "expand_macro can't expand variables"
       [ "var", String_with_vars.Var.sexp_of_t var ]
 
 let (expand_vars_string, expand_vars_path) =
@@ -304,7 +304,7 @@ let create
     ; artifacts
     ; cxx_flags
     ; vars
-    ; forms = Var.Map.forms
+    ; macros = Var.Map.macros
     ; chdir = Build.arr (fun (action : Action.t) ->
         match action with
         | Chdir _ -> action
@@ -595,8 +595,8 @@ module Action = struct
     let expand_form s var syntax_version =
       let loc = String_with_vars.Var.loc var in
       let key = String_with_vars.Var.full_name var in
-      begin match expand_form sctx ~syntax_version ~var with
-      | Some Var.Form.Exe -> Some (path_exp (map_exe (Path.relative dir s)))
+      begin match expand_macro sctx ~syntax_version ~var with
+      | Some Var.Macro.Exe -> Some (path_exp (map_exe (Path.relative dir s)))
       | Some Dep -> Some (path_exp (Path.relative dir s))
       | Some Bin -> begin
           let sctx = host sctx in
@@ -691,8 +691,8 @@ module Action = struct
       let key = String_with_vars.Var.full_name var in
       let res =
         match String_with_vars.Var.destruct var with
-        | Pair (_, s) -> expand_form s var syntax_version
-        | Single var_name ->
+        | Macro (_, s) -> expand_form s var syntax_version
+        | Var var_name ->
           begin match expand_vars sctx ~syntax_version ~var with
           | None -> String.Map.find extra_vars key
           | Some Targets ->
diff --git a/src/var.ml b/src/var.ml
index eb7a534e..8f82d897 100644
--- a/src/var.ml
+++ b/src/var.ml
@@ -17,7 +17,7 @@ module Kind = struct
     | Targets -> None
 end
 
-module Form = struct
+module Macro = struct
   type t =
     | Exe
     | Dep
@@ -58,18 +58,18 @@ module Map = struct
     ; "SCOPE_ROOT", renamed_in ~version:(1, 0) ~new_name:"project_root"
     ]
 
-  let forms =
-    let form kind = No_info kind in
-    let open Form in
-    [ "exe", form Exe
-    ; "bin", form Bin
-    ; "lib", form Lib
-    ; "libexec", form Libexec
-    ; "lib-available", form Lib_available
-    ; "version", form Version
-    ; "read", form Read
-    ; "read-lines", form Read_lines
-    ; "read-strings", form Read_strings
+  let macros =
+    let macro kind = No_info kind in
+    let open Macro in
+    [ "exe", macro Exe
+    ; "bin", macro Bin
+    ; "lib", macro Lib
+    ; "libexec", macro Libexec
+    ; "lib-available", macro Lib_available
+    ; "version", macro Version
+    ; "read", macro Read
+    ; "read-lines", macro Read_lines
+    ; "read-strings", macro Read_strings
 
     ; "dep", since ~version:(1, 0) Dep
 
@@ -152,7 +152,7 @@ module Map = struct
     Option.bind (String.Map.find t name) ~f:(fun v ->
       let what var =
         String_with_vars.Var.to_string (
-          if String_with_vars.Var.is_form var then
+          if String_with_vars.Var.is_macro var then
             String_with_vars.Var.with_payload var ~payload:(Some "..")
           else
             var)
diff --git a/src/var.mli b/src/var.mli
index 06778460..7adec4f4 100644
--- a/src/var.mli
+++ b/src/var.mli
@@ -9,7 +9,7 @@ module Kind : sig
   val to_value_no_deps_or_targets : t -> scope:Scope.t -> Value.t list option
 end
 
-module Form : sig
+module Macro : sig
   type t =
     | Exe
     | Dep
@@ -36,7 +36,7 @@ module Map : sig
 
   val create_vars : context:Context.t -> cxx_flags:string list -> Kind.t t
 
-  val forms : Form.t t
+  val macros : Macro.t t
 
   val static_vars : Kind.t t