What is "urinator imber"

Loon \Loon\, n. [For older loom, Icel. l[=o]mr; akin to Dan. & Sw. lom.] (Zo["o]l.) Any one of several aquatic, wed-footed, northern birds of the genus Urinator (formerly Colymbus), noted for their expertness in diving and swimming under water. The common loon, or great northern diver ( Urinator imber, or Colymbus torquatus), and the red-throated loon or diver ( Urinator septentrionalis), are the best known species. See Diver.

Diver \Div"er\, n.

1. One who, or that which, dives.

   Divers and fishers for pearls.
   --Woodward.

2. Fig.: One who goes deeply into a subject, study, or business. ``A diver into causes.''
   --Sir H. Wotton.

3. (Zo["o]l.) Any bird of certain genera, as Urinator (formerly Colymbus), or the allied genus Colymbus, or Podiceps, remarkable for their agility in diving.

   Note: The northern diver ( Urinator imber) is the loon; the black diver or velvet scoter ( Oidemia fusca) is a sea duck. See Loon, and Scoter.