(Phyl`lox*e"ra) n. [NL., fr. Gr. leaf + dry.]

1. (Zoöl.) A small hemipterous insect (Phylloxera vastatrix) allied to the aphids. It attacks the roots and leaves of the grapevine, doing great damage, especially in Europe.

It exists in several forms, some of which are winged, other wingless. One form produces galls on the leaves and twigs, another affects the roots, causing galls or swellings, and often killing the vine.

2. The diseased condition of a vine caused by the insect just described.

(Phy`lo*gen"e*sis Phy*log"e*ny) n. [Gr. tribe + E. genesis, or root of Gr. to be born.] The history of genealogical development; the race history of an animal or vegetable type; the historic exolution of the phylon or tribe, in distinction from ontogeny, or the development of the individual organism, and from biogenesis, or life development generally.

(Phy*lo*ge*net"ic) a. Relating to phylogenesis, or the race history of a type of organism.Phy*lo*ge*net"ic*al*ly adv.

(||Phy"lon) n.; pl. Phyla [NL., fr. Gr. race, tribe.] (Biol.) A tribe.

(||Phy"lum) n.; pl. Phyla [NL. See Phylon.] (Zoöl.) One of the larger divisions of the animal kingdom; a branch; a grand division.

(||Phy"ma) n.; pl. Phymata [NL., fr. Gr. fr. to produce.] (Med.) A tubercle on any external part of the body.

(||Phy"sa) n. [NL., fr. Gr. a bellows.] (Zoöl.) A genus of fresh-water Pulmonifera, having reversed spiral shells. See Pond snail, under Pond.

(||Phy*sa"li*a) n. [NL., fr. Gr. a bladder, fr. a bellows.] (Zoöl.) A genus of large oceanic Siphonophora which includes the Portuguese man-of- war.

It has a large air sac, or float, with a sail-like crest on its upper side. Numerous zooids of different kinds are attached to the under side of the float. Some of the zooids have very long tentacles; some have a mouth and digest food; others produce gonophores. The American species (Physalia arethusa) is brilliantly colored, the float being pink or purple, and bright blue; the zooids blue. It is noted for its virulent stinging powers, as well as for its beautiful colors, graceful motions, and its ability to sail to windward.

(||Phy*sa"li*æ) n. pl. [NL.] (Zoöl.) An order of Siphonophora which includes Physalia.

(||Phys`e*ma"ri*a) n. pl. [NL., from Gr. a blowing.] (Zoöl.) A group of simple marine organisms, usually classed as the lowest of the sponges. They have inflated hollow bodies.

(Phy*se"ter) n. [L., fr. Gr. fr. to blow: cf. F. physétère.]

1. (Zoöl.) The genus that includes the sperm whale.

2. A filtering machine operated by air pressure.

(Phys`i*an"thro*py) n. [Gr. fy`sis nature + man.] The philosophy of human life, or the doctrine of the constitution and diseases of man, and their remedies.

(Phys"ic) n. [OE. phisike, fisike, OF. phisique, F. physique knowledge of nature, physics, L. physica, physice, fr. Gr. fr. fysiko`s natural, from fy`sis nature, fr. to produce, grow, akin to E. be. See Be, and cf. Physics, Physique.]

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