In this paper we present a study of the usage of terminology in biomedical literature, with the main aim to indicate phenomena that can be helpful for automatic term recognition in the domain. Our comparative analysis is based on the terminology used in the Genia corpus. We analyse the usage of ordinary biomedical terms as well as their variants (namely inflectional and orthographic alternatives, terms with prepositions, coordinated terms, etc.), showing the variability and dynamic nature of terms used in biomedical abstracts. Term coordination and terms containing prepositions are analysed in detail. We show that there is a discrepancy between terms used in literature and terms listed in controlled dictionaries. We also evaluate the effectiveness of incorporating different types of term variation into an automatic term recognition system.
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