| amorphophallus | (noun) any plant of the genus Amorphophallus | - |
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| catchall | (noun) an enclosure or receptacle for odds and ends | - |
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| challah | (noun) (Judaism) a loaf of white bread containing eggs and leavened with yeast; often formed into braided loaves and glazed with eggs before baking | Synonyms: hallah |
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| challenge | (noun) a call to engage in a contest or fight | - |
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| (noun) questioning a statement and demanding an explanation | - |
| (noun) a formal objection to the selection of a particular person as a juror | - |
| (noun) a demand by a sentry for a password or identification | - |
| (noun) a demanding or stimulating situation | - |
| (verb) issue a challenge to | - |
| (verb) take exception to | Synonyms: dispute, gainsay |
| (verb) raise a formal objection in a court of law | Synonyms: take exception |
| (verb) ask for identification | - |
| challengeable | (adjective) capable of being challenged | - |
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| challenger | (noun) the contestant you hope to defeat | Synonyms: competition, competitor, contender, rival |
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| challenging | (adjective) requiring full use of your abilities or resources | Synonyms: ambitious |
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| (adjective) disturbingly provocative | Synonyms: intriguing |
| (adjective) stimulating interest or thought | Synonyms: thought-provoking |
| challis | (noun) a soft lightweight fabric (usually printed) | - |
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| counterchallenge | (verb) challenge in turn | - |
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| gildhall | (noun) the meeting place of a medieval guild | - |
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| guildhall | (noun) the hall of a guild or corporation | - |
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| hall | (noun) a large building for meetings or entertainment | - |
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| (noun) a large room for gatherings, receiving guests, or entertainment | - |
| (noun) an interior passage or corridor onto which rooms open | Synonyms: hallway |
| (noun) a college or university building containing living quarters for students | Synonyms: dorm, dormitory, residence hall, student residence |
| (noun) a large entrance or reception room or area | Synonyms: antechamber, anteroom, entrance hall, foyer, lobby, vestibule |
| (noun) the large room of a manor or castle | Synonyms: manor hall |
| (noun) a large and imposing house | Synonyms: manse, mansion, mansion house, residence |
| (noun) a large building used by a college or university for teaching or research | - |
| hallah | (noun) (Judaism) a loaf of white bread containing eggs and leavened with yeast; often formed into braided loaves and glazed with eggs before baking | Synonyms: challah |
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| hallelujah | (noun) a shout or song of praise to God | - |
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| halliard | (noun) a rope for raising or lowering a sail or flag | Synonyms: halyard |
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| hallmark | (noun) a distinctive characteristic or attribute of someone or something | Synonyms: earmark, stylemark, trademark |
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| (noun) a mark on an article of trade to indicate its origin and authenticity | Synonyms: assay-mark, authentication |
| halloo | (noun) a shout to attract attention | - |
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| (verb) shout `halloo', as when greeting someone or attracting attention | - |
| (verb) urge on with shouts | - |
| hallow | (verb) render holy by means of religious rites | Synonyms: bless, consecrate, sanctify |
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| hallowed | (adjective) worthy of religious veneration | Synonyms: sacred |
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| hallstand | (noun) a piece of furniture where coats and hats and umbrellas can be hung; usually has a mirror | - |
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| hallucinate | (verb) perceive what is not there; have illusions | - |
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| hallucinating | (adjective) experiencing delirium | Synonyms: delirious |
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| hallucination | (noun) a mistaken or unfounded opinion or idea | Synonyms: delusion |
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| (noun) an object perceived during a hallucinatory episode | - |
| (noun) illusory perception; a common symptom of severe mental disorder | - |
| hallucinatory | (adjective) characterized by or characteristic of hallucination | - |
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| hallucinogen | (noun) a psychoactive drug that induces hallucinations or altered sensory experiences | Synonyms: hallucinogenic drug, psychedelic drug, psychodelic drug |
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| hallucinogenic | (adjective) capable of producing hallucinations | - |
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| hallucinosis | (noun) a mental state in which the person has continual hallucinations | - |
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| hallux | (noun) the first largest innermost toe | Synonyms: big toe, great toe |
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| hallway | (noun) an interior passage or corridor onto which rooms open | Synonyms: hall |
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| marshall | (noun) a law officer having duties similar to those of a sheriff in carrying out the judgments of a court of law | Synonyms: marshal |
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| (noun) (in some countries) a military officer of highest rank | Synonyms: marshal |
| microphallus | (noun) an abnormally small penis | Synonyms: micropenis |
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| morphallaxis | (noun) regeneration on a reduced scale of a body part; observed especially in invertebrates such as certain lobsters | - |
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| phallic | (adjective) relating to a phallus especially as an embodiment of generative power | - |
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| (adjective) resembling or being a phallus | Synonyms: priapic |
| phalloidin | (noun) one of a group of toxins from the death cap (Amanita phalloides) known as phallotoxins. | - |
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| phalloplasty | (noun) reconstructive surgery on the penis to repair congenital abnormality or injury | - |
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| phallus | (noun) the male sex organ | Synonyms: member, penis |
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| pleurothallis | (noun) any of numerous small tufted orchids of the genus Pleurothallis having leathery to fleshy leaves and racemes of 1 to many small flowers | - |
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| pseudohallucination | (noun) an image vivid enough to be a hallucination but recognized as unreal | - |
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| shallon | (noun) small evergreen shrub of Pacific coast of North America having edible dark purple grape-sized berries | Synonyms: Gaultheria shallon, salal |
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| shallot | (noun) small mild-flavored onion-like or garlic-like clustered bulbs used for seasoning | - |
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| (noun) type of onion plant producing small clustered mild-flavored bulbs used as seasoning | Synonyms: Allium ascalonicum, Allium cepa aggregatum, eschalot, multiplier onion |
| (noun) aggregate bulb of the multiplier onion | - |
| shallow | (adjective) lacking physical depth; having little spatial extension downward or inward from an outer surface or backward or outward from a center | - |
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| (adjective) not deep or strong; not affecting one deeply | - |
| (adjective) lacking depth of intellect or knowledge; concerned only with what is obvious | - |
| (noun) a stretch of shallow water | Synonyms: shoal |
| (verb) become shallow | Synonyms: shoal |
| (verb) make shallow | Synonyms: shoal |
| shallowly | (adverb) in a shallow manner | - |
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| shallowness | (noun) the quality of lacking physical depth | - |
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| (noun) lack of depth of knowledge or thought or feeling | Synonyms: superficiality |
| shallu | (noun) sorghum having slender dry stalks and small hard grains; introduced into United States from India | Synonyms: Sorghum vulgare rosburghii |
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| shillyshally | (noun) the act of procrastinating; putting off or delaying or deferring an action to a later time | Synonyms: cunctation, procrastination |
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| (verb) be uncertain and vague | - |
| (verb) postpone doing what one should be doing | Synonyms: dilly-dally, dillydally, drag one's feet, drag one's heels, procrastinate, stall |
| thallium | (noun) a soft grey malleable metallic element that resembles tin but discolors on exposure to air; it is highly toxic and is used in rodent and insect poisons; occurs in zinc blende and some iron ores | Synonyms: atomic number 81, Tl |
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| thalloid | (adjective) of or relating to or resembling or consisting of a thallus | - |
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| thallophyte | (noun) any of a group of cryptogamic organisms consisting principally of a thallus and thus showing no differentiation into stem and root and leaf | - |
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| thallophytic | (adjective) pertaining to or characteristic of thallophytes | - |
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| thallus | (noun) a plant body without true stems or roots or leaves or vascular system; characteristic of the thallophytes | - |
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| unchallengeable | (adjective) not open to challenge | - |
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| unchallenged | (adjective) generally agreed upon; not subject to dispute | Synonyms: undisputed, unquestioned |
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| unhallow | (verb) remove the consecration from a person or an object | Synonyms: deconsecrate, desecrate |
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| unhallowed | (adjective) not hallowed or consecrated | Synonyms: unholy |
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