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The succession and variation of leaves during different seasons. R. Brown.

distinction from ontogeny, or the development of the individual organism, and from biogenesis, or life development generally.

The doctrine of the generation of plants.

A low evergreen plant (Chimaphila umbellata), with narrow, wedge-lanceolate leaves, and an umbel of pretty nodding fragrant blossoms. It has been used in nephritic diseases. Called also prince's pine.

cterized by irregular patches of thin scales which are shed in branlike particles. Pityriasis versicolor Etym: [NL.] (Med.), a parasitic disease of the skin, characterized by the development of reddish or brownish patches.

One of the ventral processes of a vertebra, or the dorsal element in each half of a hemal arch, forming, or corresponding to, a vertebral rib. -- Pleu*rap`o*phys"i*al, a. Owen.

r embryos of different kinds, instead of coming from a single cell; -- opposed to monogenesis.

The assumption of several structural forms without a corresponding difference in function; -- said of sponges, etc.

The act or process of combining many separate elements into a whole.

A posterior zygapophysis.

Same as Prezygapophysis.

An anterior zygapophysis.

The addition of a day to the lunar calendar. [R.] See Metemptosis.

rmination of a disease; also, the outlook afforded by this act of judgment; as, the prognosis of hydrophobia is bad.

One who makes, or holds to, progress; a progressionist.

An error in chronology, consisting in an event being dated before the actual time.

Foreknowledge of a disease; prognosis.

A growing together of parts; specifically, a morbid adhesion of the eyelids to each other or to the eyeball. Dunglison.

artificial part, to replace one that is wanting, as a log or an eye; -- called also prothesis.

subordinate member of a sentence, generally of a conditional sentence; -- opposed to apodosis. See Apodosis.