PLANETOID Meaning of PLANETOID in English ˈplanəˌtȯid noun( -s )Etymology: planet (I) + -oid 1. : a body resembling a planet2. : asteroid• plan·et·oi·dal | ̷ ̷ ̷ ̷|tȯid ə l adjective Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012