The Compendium of Caraka 4.2.21

4.2.21

vāyvagnidoṣādvṛṣaṇau tu yasya nāśaṃ gatau vātikaṣaṇḍakaḥ saḥ/
ityevamaṣṭau vikṛtiprakārāḥ karmātmakānāmupalakṣaṇīyaḥ//

He whose testicles are destroyed by a defect of wind and fire is a wind-type eunuch: / thus these eight varieties of abnormality in those determined by karma should be recognized.