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Leptology
- A minute and tedious discourse on trifling things.
Leptostraca
- An order of Crustacea, including Nebalia and allied forms.
Leptothrix
- A genus of bacteria, characterized by having their filaments very long, slender, and indistinctly articulated.
Leptus
- The six-legged young, or larva, of certain mites; -- sometimes used as a generic name. See Harvest mite, under Harvest.
Lernaeacea
- A suborder of copepod Crustacea, including a large number of remarkable forms, mostly parasitic on fishes. The young, however, are active and swim freely. See Illustration in Appendix.