Plural of louse; the human louse is of interest in that it has never developed resistance to natural pyrethrins. Life cycle
The complete cycle of events undergone by a living organism between birth (or hatching) and reproduction followed by death. Lignin
The substance that is deposited in plant cell walls to make them woody. Lignin is thus the main constituent of timber. Liliaceae
The lily family, which includes onions, leeks, garlic, shallots, etc. which are members of the genus Allium. Some taxonomists prefer to put this genus in a separate family called the Alliaceae. Lima bean
See: Phaseolus lunatus. Lime
This word has three quite distinct meaning in English. It can mean calcium oxide, as in quicklime; or the linden tree (Tilia europaea); or the citrus fruit.
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