By Swami Harshananda
Idhmavāha literally means ‘one who carries sacrificial faggots’.
The sage Dṛḍhasyu or Dṛdhāsya, the son of Agastya and Lopāmudrā, was physically so strong that he could transport sacrificial faggots normally carried by masses. Hence his father titled him such. He was an expert in the Vedic lore and austere in his personal life. He was adopted as a son by another great sage Kratu.
- The Concise Encyclopedia of Hinduism, Swami Harshananda, Ram Krishna Math, Bangalore