See Also: fermery(dictionary)
optical(dictionary)
Optical(medicine)
Optical(health)
optical(dictionary)
optical tubelength(medicine)
optical staining(medicine)
optical sectioning(medicine)
optical scrambler(medicine)
optical pachymeter(medicine)

optical illusion (oh) and fermery (iou)


optical illusion (oh)



n [C]
a picture or image that tricks your eyes and makes you see something that is not actually there

fermery (iou)



fermery noun. . LME.
[Aphet. from Old French enfermerie from medieval Latin infirmaria INFIRMARY.]
Hist. An infirmary, esp. of a monastery.