Abstract This article This article has been adapted from the author’s master’s thesis as part of completion of the European Master in Lexicography (EMLex). delves into the impact of colonialist and racist ideologies as manifested in lexicons, with a special focus on the Afrika Hand-Lexikon (1885) and other lexicons from the German colonialist period (1884–1914). By examining the front matter and selected entries from these lexicons, the article uncovers the origins of racial hierarchies and scrutinizes dehumanization tactics, including the use of animal metaphors. Moreover, the article provides historical context to understand the language and rhetorical devices employed by lexicographers such as Paul Heichen in the Afrika Hand-Lexikon. Additionally, it emphasizes the pivotal role that colonialist ideologies played in influencing the ideologies embraced by the Nazi regime in its war of extermination. Through this analysis, the article sheds light on the historical significance of lexicons in perpetuating and legitimizing derogatory language, while also underscoring their relevance in comprehending the broader socio-political impact of colonialism and racism.