The affix gha comes in the sense of 'what stays there' after the words 1. samudra and 2. abhra , in the chandas (Vedas).,
This debars यत् ॥ Thus समुद्रियः and अभ्रियः, as in समुद्रिया अप्सरसो मनीषिणम् and नानदतो अभ्रियस्येव घोषाः ॥ The word 'abhra' being a word of fewer syllables than 'samudra' ought to have come first. Its coming as a second member is an irregularity.,