Definition of shilling for English Language Learners. : a British coin used before 1971 that was equal to 1/20 of a British pound.
Esotropia is the name for crossed eyes. The condition of having eyes that don't align properly is strabismus or heterotropia. Esotropia is one type of strabismus. In exotropia, the eyes don't cross, but instead one seems to point outward. Strabismus and Tropia both mean crossed eyes.
Medical Definition of Lazy eye. Lazy eye: An eye that diverges in gaze. A lazy eye is formally called strabismus. A lazy eye (strabismus) can be due to esotropia (cross-eyed) or to exotropia (wall-eyed). The danger of the condition is that the brain comes in time to rely more on one eye than the other and that part of the brain circuitry connected to the less-favored eye fails to develop properly, leading to amblyopia (blindness) in that eye.