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  • yam

    The starchy tuberous root of various species of Dioscorea, largely cultivated for food in tropical and subtropical countries, where it takes the place of the potato.

  • yantra

    A geometrical diagram used as an aid to meditation

  • Yasargil clip

    Named after the Turkish micro-neurosurgeon M. Gazi Yasargil, it is an instrument used in surgery on the brain, in particular the treatment of aneurysms (blood filled bulges of blood vessels).

  • yellow fever

    Infectious viral disease of hot climates. Symptoms include vomiting, constipation and jaundice.

  • yoga

    Originally a Hindu spiritual practice, yoga is a system of meditation, breathing and a series of body positions. Yoga is carried out globally.