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Explanation: The form shown transcribes the masculine/singular/nominative form of the Ancient Greek participle meaning, "transforming, which transforms". The PH represents a Greek phi, and the o: represents an omega.
There are many forms of the participle: the plural of METAMORPHO:N is METAMORPHONTES; the feminine singular is METAMORPHOUSA, etc. The correct form depends on the noun that the participle modifies in the (Greek)sentence being uttered or written.