Labeorphily – collection and study of beer bottle labels Larithmics – study of population statistics Laryngology – study of larynx Lepidopterology – study of butterflies and moths Leprology – study of leprosy Lexicology – study of words and their meanings Lexigraphy – art of definition of words Lichenology – study of lichens Limacology – study of slugs Limnobiology – study of freshwater ecosystems Limnology – study of bodies of fresh water Linguistics – study of language Liturgiology – study of liturgical forms and church rituals Loimology – study of plagues and epidemics Loxodromy – study of sailing along rhumb-lines