| allomerous | (adjective) pertaining to allomerism | - |
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| ephemeron | (noun) anything short-lived, as an insect that lives only for a day in its winged form | Synonyms: ephemeral |
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| ephemeropteran | (noun) short-lived insect | Synonyms: ephemerid |
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| fumeroot | (noun) delicate European herb with greyish leaves and spikes of purplish flowers; formerly used medicinally | Synonyms: Fumaria officinalis, fumewort, fumitory |
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| (noun) herb of northern Europe and Asia having erect racemes of red flowers | Synonyms: Corydalis solida, fumewort |
| hemerobiid | (noun) small dark-colored lacewing fly | Synonyms: brown lacewing, hemerobiid fly |
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| homeroom | (noun) a classroom in which all students in a particular grade (or in a division of a grade) meet at certain times under the supervision of a teacher who takes attendance and does other administrative business | Synonyms: home room |
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| innumerous | (adjective) too numerous to be counted | Synonyms: countless, infinite, innumerable, multitudinous, myriad, numberless, uncounted, unnumberable, unnumbered, unnumerable |
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| merobenthos | (noun) benthos consisting of organisms in pre-adult stages that later become adult in the plankton. | - |
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| meromelia | (noun) congenital absence of part of an arm or leg | - |
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| meronym | (noun) a word that names a part of a larger whole | Synonyms: part name |
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| meronymy | (noun) the semantic relation that holds between a part and the whole | Synonyms: part to whole relation |
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| merozoite | (noun) a cell that arises from the asexual division of a parent sporozoan during its life cycle | - |
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| numerological | (adjective) of or relating to numerology | - |
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| numerologist | (noun) a believer in numerology | - |
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| numerology | (noun) the study of the supposed occult influence of numbers on human affairs | - |
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| numerosity | (noun) a large number | Synonyms: multiplicity, numerousness |
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| numerous | (adjective) amounting to a large indefinite number | Synonyms: legion |
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| numerousness | (noun) a large number | Synonyms: multiplicity, numerosity |
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| pentamerous | (adjective) divided into five parts; specifically, having each floral whorl consist of five (or a multiple of five) members | - |
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| tetramerous | (adjective) having or consisting of four similar parts; tetramerous flowers | - |
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| thimerosal | (noun) a light-colored crystalline powder (trade name Merthiolate) used as a surgical antiseptic | Synonyms: Merthiolate, sodium ethylmercurithiosalicylate |
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