plural i·co·si·tet·ra·he·drons, i·co·si·tet·ra·he·dra [ahy-koh-si-te-truh-hee-druh, ahy-kos-uh-]. /aɪˌkoʊ sɪˌtɛ trəˈhi drə, aɪˌkɒs ə-/.