Terrestrial \Ter*res"tri*al\, n. An inhabitant of the earth.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Terrestrial \Ter*res"tri*al\, a. [L. terrestris, from terra the earth. See Terrace.]

1. Of or pertaining to the earth; existing on the earth; earthly; as, terrestrial animals. ``Bodies terrestrial.'' --1 Cor. xv. 40.

2. Representing, or consisting of, the earth; as, a terrestrial globe. ``The dark terrestrial ball.'' --Addison.

3. Of or pertaining to the world, or to the present state; sublunary; mundane.

Vain labors of terrestrial wit. --Spenser.

A genius bright and base, Of towering talents, and terrestrial aims. --Young.

4. Consisting of land, in distinction from water; belonging to, or inhabiting, the land or ground, in distinction from trees, water, or the like; as, terrestrial serpents.

The terrestrial parts of the globe. --Woodward.

5. Adapted for the observation of objects on land and on the earth; as, a terrestrial telescope, in distinction from an astronomical telescope. -- Ter*res"tri*al*ly, adv. -- Ter*res"tri*al*ness, n.

Source: Webster's Revised Unabridged Dictionary (1913)
 

Eyepiece \Eye"piece`\, n. (Opt.) The lens, or combination of lenses, at the eye end of a telescope or other optical instrument, through which the image formed by the mirror or object glass is viewed.

Collimating eyepiece. See under Collimate.

Negative, or Huyghenian, eyepiece, an eyepiece consisting of two plano-convex lenses with their curved surfaces turned toward the object glass, and separated from each other by about half the sum of their focal distances, the image viewed by the eye being formed between the two lenses. it was devised by Huyghens, who applied it to the telescope. Campani applied it to the microscope, whence it is sometimes called Campani's eyepiece.

Positive eyepiece, an eyepiece consisting of two plano-convex lenses placed with their curved surfaces toward each other, and separated by a distance somewhat less than the focal distance of the one nearest eye, the image of the object viewed being beyond both lenses; -- called also, from the name of the inventor, Ramsden's eyepiece.

terrestrial, or Erecting eyepiece, an eyepiece used in telescopes for viewing terrestrial objects, consisting of three, or usually four, lenses, so arranged as to present the image of the object viewed in an erect position.

Source: Webster's Revised Unabridged Dictionary (1913)