首楞嚴義疏注經 8.137

8.137

十身具足，故曰形成。出因顯果，故云出胎。堪任繼嗣紹隆佛法，名法王子。

The ten bodies being complete is called 'the form is complete.' Emerging from cause and revealing the fruition is called 'emerging from the womb.' Being competent to succeed to and glorify the Buddha's Dharma, he is called a Dharma Prince.