snellen chart in Medicine Expand. Snellen chart SnelÂ·len chart (snÄl'Én) n. A chart for testing visual acuity, usually consisting of letters, numbers, or pictures printed in lines of decreasing size which a patient is asked to read or identify at a fixed distance.
Vanilla is a flavor derived from orchids of the genus Vanilla, primarily from the Mexican species, flat-leaved vanilla (V. planifolia). The word vanilla, derived from the diminutive of the Spanish word vaina (vaina itself meaning sheath or pod), translates simply as little pod.
Vanilla Shell â is an architectural expression referring to a building that is completed on the exterior only, with the possible exception of having an interior core.