| chondrule | (noun) small granule (of e.g. chrysolite) found in some meteoric rocks | - |
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| ferrule | (noun) a metal cap or band placed on a wooden pole to prevent splitting | Synonyms: collet |
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| ferule | (noun) a switch (a stick or cane or flat paddle) used to punish children | - |
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| glomerule | (noun) a compacted or sessile cyme | - |
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| metarule | (noun) a rule that describes how other rules should be used (as in AI) | - |
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| misrule | (noun) government that is inefficient or dishonest | Synonyms: misgovernment |
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| rule | (noun) measuring stick consisting of a strip of wood or metal or plastic with a straight edge that is used for drawing straight lines and measuring lengths | Synonyms: ruler |
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| (noun) a principle or condition that customarily governs behavior | Synonyms: regulation |
| (noun) something regarded as a normative example | Synonyms: convention, formula, normal, pattern |
| (noun) a rule or law concerning a natural phenomenon or the function of a complex system | Synonyms: principle |
| (noun) a basic generalization that is accepted as true and that can be used as a basis for reasoning or conduct | Synonyms: principle |
| (noun) (mathematics) a standard procedure for solving a class of mathematical problems | Synonyms: formula |
| (noun) prescribed guide for conduct or action | Synonyms: prescript |
| (noun) (linguistics) a rule describing (or prescribing) a linguistic practice | Synonyms: linguistic rule |
| (noun) directions that define the way a game or sport is to be conducted | - |
| (noun) any one of a systematic body of regulations defining the way of life of members of a religious order | - |
| (noun) dominance or power through legal authority | Synonyms: dominion |
| (noun) the duration of a monarch's or government's power | - |
| spherule | (noun) a small sphere | - |
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