Noun reservoir has 4 senses
  1. reservoir - a large or extra supply of something; "a reservoir of talent"
    --1 is a kind of
  2. reservoir, artificial lake - lake used to store water for community use
    --2 is a kind of lake
    --2 is a part of water system, water supply, water
    --2 has particulars: Lake Mead
  3. reservoir - tank used for collecting and storing a liquid (as water or oil)
    --3 is a kind of
    tank, storage tank
    --3 has particulars: cistern; sump; water tower
  4. reservoir, source - anything (a person or animal or plant or substance) in which an infectious agent normally lives and multiplies; "an infectious agent depends on a reservoir for its survival"
    --4 is a kind of thing