The Chinese word 灯芯 is formed by combining the character 灯, which means "lamp" or "light", with the character 芯, which means "wick" or "core". This combination creates a compound word where 灯 specifies the object and 芯 denotes its essential component, directly resulting in the term for "lamp wick". The formation is straightforward, with each character contributing its inherent meaning to define the whole.