becker muscular dystrophy: a form of muscular dystrophy that sets in in adolescence or adulthood and progresses slowly but will affect all voluntary muscles; characterized by generalized weakness and muscle wasting that affects limb and trunk muscles first; similar to Duchenne's muscular dystrophy but less severe; inheritance is X-linked recessive (carried by females but affecting only males)
muscular dystrophy: any of several hereditary diseases of the muscular system characterized by weakness and wasting of skeletal muscles
divider: a drafting instrument resembling a compass that is used for dividing lines into equal segments or for transferring measurements