When luṅ (Aorist) or san (Desiderative) follows ghasḷ is the substitute of ad 'to eat'.,
अघसत्, अघसताम्, अघसन् 'he ate.' The लृ in घस्लृ is servile and indicates the substitution of अङ् for च्वि of the Aorist (III. 1. 55.) So also in desiderative, as, जिघत्सति, जिघत्सतः जिघत्सन्ति 'wishes to eat.'
Vart:- The verb अद् is replaced by घस् when the affix अच् follows Thus प्र + अद् + अच् = घस् + अच् = प्रघसः 'voracious.',