单词	concave
释义	concavecon‧cave /ˌkɒnˈkeɪv◂, kən- $ ˌkɑːnˈkeɪv◂, kən-/ adjective Word Origin WORD ORIGINconcave Origin: 1500-1600 Latin concavus, from com- ( ➔ COM-) + cavus ‘hollow’ Examples EXAMPLES FROM OTHER DICTIONARIES a concave mirror EXAMPLES FROM THE CORPUS At the centre of the face was a concave portion and Nuadu knew that the jutting bone of the nose had gone. Disc harrows consisting of gangs of concave steel discs are dragged at an angle to the line of draught. Modern lizards and crocodiles have saddle-shaped shoulder joints, concave from the bottom to the top and convex from the inside out. Most myopic children can be fitted with glasses with concave lenses which will bring their vision to normal. The concave feels good, similar to the Gator but deeper if anything, simple but functional. The cone would then float up into the concave funnel and constrict the water passage, thus throttling its flow. The face was in inverse relief, with the features concave rather than convex, as for a mold. The tail is quite mellow, and concave too. word sets WORD SETS► TECHNOLOGY AC, accessory, nounadapter, nounadhesive, nounaerate, verbaerosol, nounair conditioning, nounair lock, nounairtight, adjectivealarm, nounandroid, nounantenna, nounarm, nounattachment, nounaxle, nounbaffle, nounball bearing, nounballcock, nounbarrel, nounbearing, nounbelt, nounbenzine, nounbinder, nounbinoculars, nounblock and tackle, nounblower, nounboarding, nounbolt, nounbrad, nounbrake fluid, nounbrush, nounbucket, nounbuffer, nounbulb, nounBulldog clip, nounbutton, nounbuzzer, nouncable, nouncalibre, nouncam, nouncan, nouncar, nouncarriage, nouncartridge, nouncasing, nouncaster, nouncatalytic converter, nouncentrifuge, nounchannel, nounchicken wire, nounchute, nouncladding, nounclamp, nouncleat, nouncog, nouncogwheel, nouncombination lock, nouncompartment, nouncompressor, nounconcave, adjectiveconcavity, nounconfiguration, nouncontrol, nouncord, nouncounter, nouncrank, nouncutout, nouncyborg, nouncycle, noundamper, noundetector, noundevelop, verbdevice, noundial, noundie, verbdigital, adjectivedispenser, noundissipation, noundistill, verbdrum, nounduct, noundurable goods, noundynamite, noundynamite, verbenergize, verbengage, verbexhaust, nounextractor, nounfacility, nounfail-safe, adjectivefaucet, nounfeed, nounfiberglass, nounfibreglass, nounfield test, nounfilament, nounfilter, nounfirst generation, nounfitting, nounflange, nounflare, nounflex, nounfloodlight, nounfluid, nounfluoridate, verbflush, verbflywheel, nounfoam, verbframe, nounframework, nounfunnel, noungabardine, noungasket, noungas turbine, noungear, noungel, verbgelatinous, adjectivegelignite, noungenetic fingerprinting, nounglaze, verbglue, noungoggles, noungrab, noungrease, noungrease, verbgrid, noungrind, verbgrindstone, noungrommet, noungum, noungun, nounhand-held, adjectivehandle, nounhandloom, nounhandmade, adjectivehandsfree, adjectivehardware, nounharness, nounhasp, nounheavy-duty, adjectiveheavy metal, nounhessian, nounhigh-definition, adjectivehigh-powered, adjectivehinge, nounhooter, nounhousing, nounhub, nounhumidifier, nounincinerate, verbincinerator, nounindustrial arts, nounIndustrial Revolution, the, nouninlay, nouninlet, nouninoperative, adjectiveinsecticide, nouninset, verbinstall, verbinstallation, nouninstrumentation, nouninsulate, verbintake, nouninternal combustion engine, nouninverse, adjectiveionizer, nouniron, nouniron, verbjack, nounjib, nounkey, nounkeyboard, verbkey card, nounkeypad, nounkeystroke, nounkingpin, nounlaser, nounLCD, nounlead, nounlens, nounlever, nounlie detector, nounlift, nounlight bulb, nounlinseed oil, nounlistening device, nounlocomotion, nounloop, verbLuddite, nounmachine, verbmachine-made, adjectivemagnet, nounmagnetic, adjectivemagnifying glass, nounmantle, nounmanual, adjectivemap, verbmarker, nounmastic, nounmaterial, nounmechanism, nounmedium, nounmembrane, nounmesh, verbmetal detector, nounmethanol, nounmeths, nounmethyl alcohol, nounmica, nounmicro-, prefixmicroscope, nounmicroscopic, adjectivemode, nounmortise lock, nounmounting, nounmovement, nounnail, nounnail, verbnet, nounnib, nounnipple, nounnitroglycerine, nounnozzle, nounnut, nounoil, verboilcan, nounoperable, adjectiveoperate, verboperation, nounoperational research, nounoperator, nounoutlet, nounoxidize, verboxygen mask, nounozone-friendly, adjectivepad, nounpadlock, nounpaper, nounpart, nounpaving, nounPhotostat, nounpinion, nounpipe, nounpipette, nounpocket calculator, nounpointer, nounpolygraph, nounportico, nounpropellant, nounpump-action, adjectiverack, nounreel, nounrefrigerate, verbrelease, verbrelease, nounremote control, nounreservoir, nounresolution, nounrespirator, nounrobot, nounrobotics, nounsafe, nounsealant, nounsealer, nounsearchlight, nounsensitize, verbsetting, nounshovel, nounshovel, verbsiphon, nounsiren, nounskeleton key, nounslat, nounslide, nounsling, nounsmoke alarm, nounsonic, adjectivesoot, nounspare part, nounspigot, nounspool, nounspout, nounspray, nounspray can, nounspring, nounsprocket, nounstaple, nounsteel wool, nounsucker, nounsuction, nounSuperglue, nounswivel, nountab, nountackle, nountank, nountape, nountaper, nountechnological, adjectivetechnologist, nountechnophobe, nountelescopic, adjectivetesting ground, nountest tube, nounthinner, nounthread, nountoken, nountreadle, nountrestle, nountrestle table, nountube, nountubing, nountubular, adjectivetwo-edged, adjectivetypewriter, noununscrew, verbuntreated, adjectivevacuum-packed, adjectivevent, nounvial, nounwasher, nounwater softener, nounwaterspout, nounwheeled, adjectivewing nut, nounwooden, adjectivework-surface, nounzapper, noun a concave surface is curved inwards in the middle OPP  convex:  a concave lens
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