The word "trophoplast" is spelled using the phonetic transcription /ˈtrɒfəˌplɑːst/. Each syllable in the word is pronounced separately: "tro-fo-plast." The "o" in the first syllable is pronounced like the "o" in "hot." The "a" in the final syllable is pronounced like the "a" in "father." The "p" in "plast" is silent. Trophoplast refers to the outer layer of protoplasm in a plant cell. It is an important cellular component in photosynthesis.