Protozoa (pro-to-zo'ah)

The lowest subdivision or phylum of the animal kingdom, consisting always of a single cell. It includes many species pathogenic to mal.] man. [Gr., protos, first, -fsoon, aniprotozool'ogy. of the Protozoa. The science which treats protuberance (pro-tu'ber-ans). like projection. cerebral p.A A knobp. formed by the upper of the two flexures of the cerebral extremity of the embryo. external occipital p. Syn.: occipital eminence. A p. on the outer surface of the tabular portion of the occipital bone, near its center, frontal p. The lower p. of the two formed by the flexures of the cerebral extremity of the embryo, inferior maxillary p's. Two p's, one on each side, formed by a division of the first pharyngeal arch of the embryo, being the rudiments of the lower jaw. internal occipital p. A p. on the inner surface of the tabular portion of the occipital bone. lateral frontal p's. Two p's formed one on each side of the frontal p. of the emswell.] bryo. [Lat., pro, before, + tuber are, to protyl (pro'til). An old name for methyl, so called as being the first of the series of univalent hydrocarbons. [Gr., protos, first, + yle, matter.]