When necessary, always create a JPG or PNG for use on the web from this master vector file. Just be sure to save the new raster file in the exact dimensions needed. *A PDF is generally a vector file. However, depending how a PDF is originally created, it can be either a vector or a raster file.
tetracaine - a crystalline compound used in the form of a hydrochloride as a local anesthetic local anaesthetic, local anesthetic, topical anaesthetic, topical anesthetic, local - anesthetic that numbs a particular area of the body
It is a group of four things, like cells, spores, anything biological. I would recommend looking at Wikipedia for more examples. . A tetrad is a group of four. It may refer to: Tetrad (chromosomal formation) Tetrad (genetics), the four spores of a yeast; Tetrad (general relativity), a mathematical frame of reference in general relativity; Tetrad (index notation), a concept in differential geometry; Tetrad (music), a set of four notes; Tetrad (symbol) or tetractys; Tetrad (unit of area) Tetrad, a group of four haploid and immature pollen grains in tetrahedral fashion produced by meiotic microsporogenesis Tetrad (astronomy), an occurrence of 4 total lunar eclipses in a row with intervals of 6 lunations .