oil (oyl) a fat in a liquid state (p. 22) oogamy (oh-og'uh-mee) sexual reproduction in which the female gamete, or egg, is nonmotile and larger than the male gamete, or sperm, which is motile (p. 332) oogonium (pl. oogonia) (oh-oh-goh'nee-um; pl. oh-oh-goh'nee-ah) a female sex organ of certain algae and fungi; it consists of a single cell that contains one to several eggs (p. 332, 351)

operculum (oh-per'kyu-lum) the lid or cap that protects the peristome of a moss sporangium (p. 391) orbital (or'buh-till) a volume of space in which a given electron occurs 90% of the time (p. 15) order (or'dur) a category of classification between a class and a family (p. 290) organelle (or-guh-nel') a membrane-bound body in the cytoplasm of a cell; there are several kinds, each with a specific function (e.g., mitochondrion, chloro-plast)1 (p. 32) organic (or-gan'ik) pertaining to or derived from living organisms and pertaining to the chemistry of carbon-containing compounds (p. 21) osmosis (oz-moh'sis) the diffusion of water or other solvents through a differentially permeable membrane from a region of higher concentration to a region of lower concentration (p. 156) osmotic potential (oz-mot'ik puh-ten'shil) potential pressure that can be developed by a solution separated from pure water by a differentially permeable membrane (the pressure required to prevent osmosis from taking place) (p. 157) osmotic pressure (oz-mot'ik presh'ur) see osmotic potential outcrossing (out'kross-ing) cross-pollination between individuals of the same species (p. 258) ovary (oh'vuh-ree) the enlarged basal portion of a pistil that contains an ovule or ovules and usually develops into a fruit (p. 133)

ovule (oh'vyool) a structure of seed plants that contains a female gametophyte and has the potential to develop into a seed (p. 133, 422) oxidation-reduction reactions (ok-suh-day'shun ree-duk'shun) chemical reactions involving gain or loss of electrons to or from a compound (p. 172)

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