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Heidegger’s critique of Aristoteles’ definition of mankind as ζώον λόγον έχον is a long and still attractive chapter in his philosophy. We see often in Heidegger’s works that he appeals to the Latin translation (or the Latin interpretation, as he says) of animal rationale as a way to criticize western metaphysics. The conception of mankind in western metaphysics, culture, and thought is based on the Aristotelian definition. This paper aims to discuss the role and importance of this definition in Heidegger's thought. Broadly speaking, he has two kinds of discussion about it: there is a question concerning human beings, but in so far as it is the Being-question; and there is a question concerning language. Here we restrict ourselves to the latter. Firstly, in the introduction part, we will justify posing a question about the human being and will show that such a question is a kind of Being-question. After that, in the first part, based on Heidegger’s lecture The Ground Problems of Metaphysics (1929/30) we will explore those language-problems which are arisen from the Aristotelian definition. Heidegger's starting point is λόγος, i.e. speech or language, which is taken from ζώον λόγον έχον. Finally, in the second part, we will explore the same problem in Heidegger’s Being and Time. [ABSTRACT FROM AUTHOR]