Correct

定形

/ dìng xíng / 
Strokes

Example

As a Verb

take form/shape

1
Jìhuà
计划
shàngwèi
尚未
dìngxíng
定形
  
。

The plan has not taken shape yet.

As a Noun

setting

2
Rèdìngxíng
热定形

heat setting

As a Noun

boarding

3
Dìngxíngjī
定形机

boarding machine