orthokeratology or·tho·ker·a·tol·o·gy (ôr'thō-kěr'ə-tŏl'ə-jē)
n.
A method of improving unaided vision by molding the cornea with contact lenses.
| an obscure term ostensibly referring to a lung disease caused by silica dust, sometimes cited as one of the longest words in the English language. |
| a white, crystalline, water-insoluble, powerful high explosive, C3H6N6O6, used chiefly in bombs and shells. |