| adenoidal | (adjective) of or pertaining to the adenoids | - |
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| (adjective) sounding as if the nose were pinched | Synonyms: nasal, pinched |
| alkaloidal | (adjective) pertaining to or consisting of alkaloids | - |
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| amygdaloidal | (adjective) shaped like an almond | Synonyms: almond-shaped, amygdaliform, amygdaloid |
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| amyloidal | (adjective) resembling starch | Synonyms: amylaceous, amyloid, farinaceous, starchlike |
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| anthropoidal | (adjective) resembling apes | Synonyms: anthropoid, apelike |
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| apsidal | (adjective) of or relating to an apse | - |
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| araneidal | (adjective) relating to or resembling a spider | Synonyms: araneidan |
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| asteroidal | (adjective) of or relating to or resembling an asteroid | - |
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| autacoidal | (adjective) of or relating to an autacoid | - |
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| bactericidal | (adjective) preventing infection by inhibiting the growth or action of microorganisms | Synonyms: disinfectant, germicidal |
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| bacterioidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacteroid, bacteroidal |
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| bacteroidal | (adjective) resembling bacteria | Synonyms: bacterioid, bacterioidal, bacteroid |
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| botryoidal | (adjective) resembling a cluster of grapes in form | Synonyms: botryoid, boytrose |
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| bridal | (adjective) of or pertaining to a bride | - |
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| (adjective) of or relating to a wedding | Synonyms: nuptial, spousal |
| centroidal | (adjective) of or relating to (especially passing through) a centroid | - |
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| chancroidal | (adjective) of or relating to or having chancroids | - |
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| colloidal | (adjective) of or relating to or having the properties of a colloid | - |
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| cotyloidal | (adjective) of the cup-shaped socket that receives the head of the thigh bone | Synonyms: acetabular, cotyloid |
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| cuboidal | (adjective) shaped like a cube | Synonyms: cube-shaped, cubelike, cubical, cubiform, cuboid |
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| cuspidal | (adjective) having cusps or points | Synonyms: cuspate, cuspated, cusped, cuspidate, cuspidated |
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| cycloidal | (adjective) resembling a circle | Synonyms: cycloid |
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| dendroidal | (adjective) resembling a tree in form and branching structure | Synonyms: arboreal, arboreous, arborescent, arboresque, arboriform, dendriform, dendroid, tree-shaped, treelike |
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| discoidal | (adjective) having a flat circular shape | Synonyms: disc-shaped, disclike, discoid, disk-shaped, disklike |
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| ellipsoidal | (adjective) having the nature or shape of an ellipsoid | Synonyms: ellipsoid, spheroidal |
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| fungicidal | (adjective) capable of destroying fungi | Synonyms: antifungal |
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| germicidal | (adjective) preventing infection by inhibiting the growth or action of microorganisms | Synonyms: bactericidal, disinfectant |
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| homicidal | (adjective) characteristic of or capable of or having a tendency toward killing another human being | Synonyms: murderous |
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| hyperboloidal | (adjective) having the shape of a hyperboloid | - |
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| insecticidal | (adjective) of or relating to insecticide | - |
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| intertidal | (adjective) of or relating to the littoral area above the low-tide mark | - |
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| mastoidal | (adjective) relating to or resembling a nipple | Synonyms: mastoid |
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| mucoidal | (adjective) relating to or resembling mucus | Synonyms: mucoid |
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| nonsteroidal | (adjective) not steroidal or not having the effects of steroid hormones | - |
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| paraboloidal | (adjective) having the shape of a paraboloid | - |
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| parasiticidal | (adjective) capable of expelling or destroying parasitic worms | Synonyms: anthelminthic, anthelmintic, helminthic |
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| pyramidal | (adjective) resembling a pyramid | Synonyms: pyramidic, pyramidical |
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| rhizoidal | (adjective) of or relating to a rhizoid | - |
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| rhomboidal | (adjective) shaped like a rhombus or rhomboid | Synonyms: rhomboid |
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| sigmoidal | (adjective) of or relating to the sigmoid flexure in the large intestine | Synonyms: sigmoid |
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| sinusoidal | (adjective) having a succession of waves or curves | - |
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| spermicidal | (adjective) destructive to spermatozoa | - |
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| spheroidal | (adjective) having the nature or shape of an ellipsoid | Synonyms: ellipsoid, ellipsoidal |
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| steroidal | (adjective) of or relating to steroid hormones or their effects | - |
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| suicidal | (adjective) dangerous to yourself or your interests | Synonyms: self-destructive |
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| thyroidal | (adjective) of or relating to the thyroid gland | Synonyms: thyroid |
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| tidal | (adjective) of or relating to or caused by tides | - |
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| toroidal | (adjective) of or relating to or shaped like a toroid; doughnut shaped | - |
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| trapezoidal | (adjective) resembling a trapezoid | - |
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| viricidal | (adjective) tending to destroy viruses | Synonyms: virucidal |
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| virucidal | (adjective) tending to destroy viruses | Synonyms: viricidal |
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