| deleterious | (adjective) harmful to living things | Synonyms: hurtful, injurious |
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| detergent | (adjective) having cleansing power | Synonyms: detersive |
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| determinable | (adjective) capable of being determined or limited or fixed | - |
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| determinant | (adjective) having the power or quality of deciding | Synonyms: deciding, determinative, determining |
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| determinate | (adjective) precisely determined or limited or defined; especially fixed by rule or by a specific and constant cause | - |
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| (adjective) not continuing to grow indefinitely at the apex | - |
| (adjective) supplying or being a final or conclusive settlement | Synonyms: definitive |
| determinative | (adjective) having the power or quality of deciding | Synonyms: deciding, determinant, determining |
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| determined | (adjective) having been learned or found or determined especially by investigation | - |
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| (adjective) strongly motivated to succeed | Synonyms: compulsive, driven |
| (adjective) characterized by great determination | - |
| (adjective) determined or decided upon as by an authority | Synonyms: dictated, set |
| (adjective) devoting full strength and concentrated attention to | - |
| determining | (adjective) having the power or quality of deciding | Synonyms: deciding, determinant, determinative |
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| deterministic | (adjective) an inevitable consequence of antecedent sufficient causes | - |
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| deterrent | (adjective) tending to deter | - |
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| detersive | (adjective) having cleansing power | Synonyms: detergent |
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| eternal | (adjective) tiresomely long; seemingly without end | Synonyms: endless, interminable |
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| (adjective) continuing forever or indefinitely | Synonyms: aeonian, ageless, eonian, everlasting, perpetual, unceasing, unending |
| heterocercal | (adjective) possessing a tail with the upper lobe larger than the lower and with the vertebral column prolonged into the upper lobe | - |
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| heterocyclic | (adjective) containing a closed ring of atoms of which at least one is not a carbon atom | - |
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| heterodactyl | (adjective) (of bird feet) having the first and second toes directed backward the third and fourth forward | - |
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| heterodox | (adjective) characterized by departure from accepted beliefs or standards | Synonyms: dissident, heretical |
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| heterodyne | (adjective) of or relating to the beat produced by heterodyning two oscillations | - |
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| heteroecious | (adjective) of parasites; passing through different stages of the life cycle on different host species | - |
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| heterogeneous | (adjective) consisting of elements that are not of the same kind or nature | Synonyms: heterogenous |
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| (adjective) originating outside the body | Synonyms: heterogenous |
| heterogenous | (adjective) originating outside the body | Synonyms: heterogeneous |
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| (adjective) consisting of elements that are not of the same kind or nature | Synonyms: heterogeneous |
| heteroicous | (adjective) having several forms of gametoecia on the same plant | Synonyms: polygamous, polyoicous |
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| heterologic | (adjective) not corresponding in structure or evolutionary origin | Synonyms: heterological, heterologous |
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| heterological | (adjective) not corresponding in structure or evolutionary origin | Synonyms: heterologic, heterologous |
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| heterologous | (adjective) derived from organisms of a different but related species | - |
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| (adjective) not corresponding in structure or evolutionary origin | Synonyms: heterologic, heterological |
| heterometabolic | (adjective) (of an insect) undergoing incomplete metamorphosis in which the nymph is essentially like the adult and there is no pupal stage | Synonyms: heterometabolous |
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| heterometabolous | (adjective) (of an insect) undergoing incomplete metamorphosis in which the nymph is essentially like the adult and there is no pupal stage | Synonyms: heterometabolic |
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| heterosexual | (adjective) sexually attracted to members of the opposite sex | - |
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| heterosporous | (adjective) characterized by heterospory | - |
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| heterothermic | (adjective) of animals except birds and mammals; having body temperature that varies with the environment | Synonyms: ectothermic, poikilothermic, poikilothermous |
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| heterotrophic | (adjective) requiring organic compounds of carbon and nitrogen for nourishment | - |
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| heterozygous | (adjective) having dissimilar alleles at corresponding chromosomal loci | - |
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| indeterminable | (adjective) not capable of being definitely decided or ascertained | Synonyms: undeterminable |
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| (adjective) incapable of being definitely ascertained or calculated | - |
| indeterminate | (adjective) not precisely determined or established; not fixed or known in advance | Synonyms: undetermined |
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| (adjective) having a capacity for continuing to grow at the apex | - |
| (adjective) of uncertain or ambiguous nature | - |
| (adjective) not leading to a definite ending or result | - |
| (adjective) (of a quantity) having no definite value, as an equation that cannot be solved | - |
| inveterate | (adjective) habitual | Synonyms: chronic |
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| predetermined | (adjective) set in advance | Synonyms: preset |
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| preternatural | (adjective) surpassing the ordinary or normal | Synonyms: uncanny |
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| (adjective) existing outside of or not in accordance with nature | Synonyms: nonnatural, otherworldly, transcendental |
| telemetered | (adjective) of or pertaining to telemetry | - |
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| undeterminable | (adjective) not capable of being definitely decided or ascertained | Synonyms: indeterminable |
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| undetermined | (adjective) not yet having been ascertained or determined | - |
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| (adjective) not precisely determined or established; not fixed or known in advance | Synonyms: indeterminate |
| (adjective) not brought to a conclusion; subject to further thought | Synonyms: open, undecided, unresolved |
| undeterred | (adjective) not deterred | Synonyms: undiscouraged |
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| veteran | (adjective) rendered competent through trial and experience | Synonyms: seasoned |
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| veterinary | (adjective) of or relating to veterinarians or veterinary medicine | - |
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