Assuming that “philosophy finds its place in natural language” (DERRIDA, 1988, p. 36) and a linguistic-cultural view of deafness, the Philosophy classes with deaf students pose specific problems. The translation of philosophical concepts raises particular difficulties due to the characteristics of the two languages (vocal language and sign language). In addition, not all philosophical concepts have standard gesture in Portuguese sign language. Given the theoretical commitment and the legal enforcement (Portuguese law) of all the classes being in Portuguese sign language we tried to understand how does this language solve the problem of the absence of standard sign. In order to do so we asked a group of deaf teachers of Portuguese sign language to explain philosophical texts in which exist some of those concepts. Subsequently, we analised those productions in order to find enlightening results.