| annul | (verb) cancel officially | Synonyms: countermand, lift, overturn, repeal, rescind, reverse, revoke, vacate |
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| (verb) declare invalid | Synonyms: avoid, invalidate, nullify, quash, void |
| annular | (adjective) shaped like a ring | Synonyms: annulate, annulated, circinate, doughnut-shaped, ring-shaped, ringed |
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| annulate | (adjective) shaped like a ring | Synonyms: annular, annulated, circinate, doughnut-shaped, ring-shaped, ringed |
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| annulated | (adjective) shaped like a ring | Synonyms: annular, annulate, circinate, doughnut-shaped, ring-shaped, ringed |
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| annulet | (noun) molding in the form of a ring; at top of a column | Synonyms: bandelet, bandelette, bandlet, square and rabbet |
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| (noun) (heraldry) a charge in the shape of a small ring | - |
| annulment | (noun) (law) a formal termination (of a relationship or a judicial proceeding etc) | Synonyms: invalidation |
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| (noun) the act of abrogating; an official or legal cancellation | Synonyms: abrogation, repeal |
| (noun) the state of being cancelled or annulled | Synonyms: revocation |
| annulus | (noun) (Fungi) a remnant of the partial veil that in mature mushrooms surrounds the stem like a collar | Synonyms: skirt |
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| (noun) a toroidal shape | Synonyms: anchor ring, doughnut, halo, ring |
| cannula | (noun) a small flexible tube inserted into a body cavity for draining off fluid or introducing medication | - |
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| cannular | (adjective) constituting a tube; having hollow tubes (as for the passage of fluids) | Synonyms: tube-shaped, tubelike, tubular, vasiform |
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| cannulate | (verb) introduce a cannula or tube into | Synonyms: cannulise, cannulize, canulate, intubate |
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| cannulation | (noun) the insertion of a cannula or tube into a hollow body organ | Synonyms: cannulisation, cannulization, canulation, canulisation, canulization, intubation |
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| cannulisation | (noun) the insertion of a cannula or tube into a hollow body organ | Synonyms: cannulation, cannulization, canulation, canulisation, canulization, intubation |
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| cannulise | (verb) introduce a cannula or tube into | Synonyms: cannulate, cannulize, canulate, intubate |
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| cannulization | (noun) the insertion of a cannula or tube into a hollow body organ | Synonyms: cannulation, cannulisation, canulation, canulisation, canulization, intubation |
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| cannulize | (verb) introduce a cannula or tube into | Synonyms: cannulate, cannulise, canulate, intubate |
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| pinnule | (noun) division of a usually pinnately divided leaf | Synonyms: pinna |
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