Résumé. Dans cet article, je me propose d'étudier la construction [[X]SN genre [Y]SN] danslaquelle le nom genre met en relation deux syntagmes nominaux, comme dans les exemples (1) et (2) : (1) sinon il reste plus cas coller un par un des cailloux avec un truc genre mastic polyeurethane (Doc., bricolage). (1) and (2) : (1) sinon il reste plus cas coller un par un des cailloux avec un truc genre mastic polyeurethane (Doc., bricolage) 'Otherwise all that's left to do is to stick the stones one by one with something like polyurethane mastic' (2) Pour le moment, au bout de 9 jours de prises, rien n'a changé, ni mon moral, ni les douleurs et mêmes les gratouillis genre urticaire. (Doc., Alzheimer & Parkinson) 'For now, after 9 days of treatment, nothing has changed, neither my mood, nor the pains, nor even the urticaria-like itches' This study is based on a corpus of messages taken from online forums, as the construction is particularly frequent in this type of discourse. I show that the construction [[X]SN genre [Y]SN] has a real, non strictly compositional meaning, that makes it a genuine construction as defined by construction grammar. Being fundamentally exemplifying, this construction gives rise to an ad hoc category in discourse on the basis of a category denoted by [X]SN and one or more individuals denoted by [Y]SN. Marginally, the construction offers another interpretation, which is closer to approximative categorisation than to exemplification (especially in relation to naming issues). The analysis developed in this study is transposable to other similar constructions involving other nouns than genre (e.g. style 'style', type 'type, sort', façon 'way') and [X]SN and [Y]SN of a different nature (e.g. adjective phrases, adverb phrases, full clauses)., Web of Conferences (2016)