The word "而且" is formed by combining the characters "而" and "且", both of which independently function as conjunctions in Classical Chinese. "而" often indicates continuation or slight contrast, while "且" typically expresses addition or progression. When joined, they create a compound conjunction that reinforces the idea of adding information, resulting in the meaning "and moreover" or "furthermore". This construction directly merges two grammatical elements to emphasize an enhanced additive relationship in sentences.