that+cannot+be+seen
111occult blood — n. (Medicine) blood in the feces in such small quantities that cannot be seen by the naked eye but can be detected by chemical tests …
112slip stitch — stitch that cannot be seen, blind stitch …
113information signs displayed at airports — These signs displayed at airfields provide the pilot with information on such things as areas that cannot be seen from the control tower, applicable radio frequencies, and noise abatement procedures. Information signs include direction signs,… …
114opaque — Something that cannot be seen through; the opposite of transparent, although something through which some light passes would be described as translucent. (pr. oh pake ) Also see opacity …
115blur — verb (blurs, blurring, blurred) make or become unclear or less distinct. noun something that cannot be seen, heard, or recalled clearly. Derivatives blurry adjective (blurrier, blurriest). Origin C16 (in the sense smear ): perh. related to blear …
116invisible ink — noun a type of ink used to produce writing that cannot be seen until the paper is heated or otherwise treated …
117invisible ink — noun (U) secret ink that cannot be seen on paper until it is heated …
118presence — / prezFns/ noun 1 (U) the state of being present in a particular place: Your presence is requested at the club meeting on Friday. (+ of): The police scientists detected the presence of poison in the dead woman s blood. opposite absence (1) 2 in… …
119radiant — UK [ˈreɪdɪənt] / US adjective 1) someone who is radiant looks extremely happy a radiant bride 2) very bright The sea was a radiant blue. 3) science radiant heat is the energy produced by hot objects. It is in the form of infrared light that… …
120infrared — [ˌɪnfrəˈred] adj using a type of light that cannot be seen infrared sensors[/ex] …
