(Latin: a suffix; pertaining to, of the nature of, like; denoting an agent)
2. An isotope with a different atomic weight than the naturally occurring form of the same element.
Catherine knelt at the altar to pray.
2. To castrate or to spay an animal; such as, a cat or a dog: The family dog was taken to the animal center so the vet could alter it.
The minister wanted to alter the church altar before the next worship service.
2. With two eyepieces, as in a binocular microscope.
3. Involving or using both eyes, or relating to vision using both eyes.
As stated above, binoculars are field glasses adapted to the use of both eyes, in contrast with the telescope, which is a monocular instrument.
2. The use by certain animals of echoes of sounds they produce to locate objects in the perceptual field as with bats as they move around.