gast(e)-, n. Stone (material). Gender: B, Stems: /stː/ <stt> - /st/ <st> - /sð/ <sd>, Ablaut: /a/ <a> - /ɒ/ <å> - /a/ <a>, Nominative singular: /ɣastːa/ <gastta>, Accusative singular: /ɣɒsti/ <gåsti>, Allative singular: /ɣasðɛβɒ/ <gasdebå> This is commonly used in compounds to form the names of types of stone.