iti - thus; abhidhyāyataḥ - while thinking; nāsā-vivarāt - from the nostrils; sahasā - all of a sudden; anagha - O sinless one; varāha-tokaḥ - a minute form of Varāha (a boar); niragāt - came out; aṅguṣṭha - the upper portion of the thumb; parimāṇakaḥ - of the measurement.

O sinless Vidura, all of a sudden, while Brahmā was engaged in thinking, a small form of a boar came out of his nostril. The measurement of the creature was not more than the upper portion of a thumb.