Dictionary Definition :
Definition[1]
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The four great scholars (among the 500 arhats) who made the Vibhāsā-śāstra, a critical commentary on the Abhidharma. Their names are 世友 Vasumitra, 妙音 Ghosa, 法救 Dharmatrāta, and 覺天 Buddhadeva.
Source
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A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous
Page
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[A Dictionary of Chinese Buddhist Terms, William Edward Soothill and Lewis Hodous]
Definition[2]
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四評家===(名數)大毘婆沙論說五百阿羅漢集,而評釋發智論者也。其中以世友,妙音,法救,覺天之四論師為評家之正義。華嚴玄談七曰:「言評家者,婆沙是諸阿羅漢同集,而有四大阿羅漢,為評家正義:一世友,二妙音,三法救,四覺天。」
Source
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丁福保《佛學大辭典》