The word syad is formed by ghañ in the sense of 'speed'.,
This word is derived from स्यन्द, the nasal is elided, and the Vriddhi prohibited irregularly. Though the ardhadhatuka affix घञ् causes here the elision of a portion of the root, viz of न् of स्यन्द्, yet rule (I. I. 4) does not apply here. That rule prohibits Guna and Vriddhi, only in case of इक् vowels, here the Vriddhi is prevented with regard to अ ॥ The prevention of this Vriddhi is irregular and not governed by (I. I. 4). Thus गोस्यदः अश्वस्यदः meaning \cow-speed,\ \horse-speed.\ but तैलस्यन्दः, and घृतस्यन्दः meaning \dripping of oil or ghee\.,