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.
The British Medical Journal defines it as Sex that does not extend beyond affection, mutual masturbation, and oral and anal sex. [1] The term vanilla derives from the use of vanilla extract as the basic flavoring for ice cream, and by extension meaning plain or conventional.