The spelling of the word "most conoid" is determined by its pronunciation. To help with this, the International Phonetic Alphabet (IPA) is used. The word "most" is spelled with an "o" sound that is pronounced as a "məʊst". Meanwhile, "conoid" is pronounced as "kɒnɔɪd". With this in mind, the spelling of the entire phrase is: /məʊst kɒnɔɪd/. The phrase indicates the shape of an object that is cone-shaped or conical, with the word "most" indicating its degree to which it has the shape of a cone.