Concavity
Nouns
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concavity, depression, dip
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hollow, hollowness
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indentation, intaglio, cavity, dent, dint, dimple, follicle, pit, sinus, alveolus, lacuna
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excavation, strip mine
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trough etc. (furrow) Furrow
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honeycomb. cup, basin, crater, punch bowl
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cell etc. (receptacle) Receptacle
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socket. valley, vale, dale, dell, dingle, combe, bottom, slade, strath, glade, grove, glen, cave, cavern, cove
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grot, grotto
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alcove, cul-de-sac
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gully etc. Interval
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arch etc. (curve) Curvature
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bay etc. (of the sea) Gulf. Lake. excavator, sapper, miner. honeycomb (sponge) Concavity.Existence.
Verbs
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be concave etc. adj.
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retire, cave in. render concave etc. adj.
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depress, hollow
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scoop, scoop out
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gouge, gouge out, dig, delve, excavate, dent, dint, mine, sap, undermine, burrow, tunnel, stave in.
Adjectives
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depressed etc. v.
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alveolate, calathiform, cup-shaped, dishing
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favaginous, faveolate, favose
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scyphiform, scyphose
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concave, hollow, stove in
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retiring
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retreating
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cavernous
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porous etc. (with holes) Opening
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infundibul, infundibular, infundibuliform
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funnel shaped, bell shaped
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campaniform, capsular
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vaulted, arched.