1) Large amount of resistance 2) Resistance unit 3) Resistor unit 4) Unit of electrical resistance 
• (n.) One of the larger measures of electrical resistance, amounting to one million ohms.
(from the article `ohmmeter`) ...will decrease as resistance rises. Ratio meters measure the ratio of the voltage across the resistance to the current flowing through it. For high ...
(meg´ōm) one million (106) ohms.
Meg'ohm' noun [ Mega- + ohm .] (Electricity) One of the larger measures of electrical resistance, amounting to one million ohms. 
Type: Term Pronunciation: meg′ōm Definitions: 1. One million ohms.
[n] - a unit of resistance equal to one million ohms
noun a unit of resistance equal to one million ohms