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1. Oxford Dictionary

   ultrabasic

   • IPA[ˌʌltrəˈbɛɪsɪk]

   英式

   • adj.
     relating to or denoting igneous rocks having a silica content less than 45 per cent by weight.
2. • 更多解釋

   ultrabasic

   • IPA[ˌəltrəˈbāsik]

   美式

   • adj.
     relating to or denoting igneous rocks having a silica content less than 45 percent by weight, ...

   Oxford American Dictionary