Plagal cadence, a cadence in which the final chord on the tonic is preceded by the chord on the subdominant.

(Pla"gate) a. (Zoöl.) Having plagæ, or irregular enlongated color spots.

(Plage) n. [F., fr. L. plaga.] A region; country. [Obs.] "The plages of the north." Chaucer.

(Pla"gia*rism) n. [Cf. F. plagiarisme.]

(Plack) n. [F. plaque a plate of metal. Cf. Plaque.] A small copper coin formerly current in Scotland, worth less than a cent.

With not a plack in the pocket of the poet.
Prof. Wilson.

(Plack"et) n. [F. plaquer to lay or clap on. See Placard.]

1. A petticoat, esp. an under petticoat; hence, a cant term for a woman. [Obs.] Beau. & Fl.

2. The opening or slit left in a petticoat or skirt for convenience in putting it on; — called also placket hole.

3. A woman's pocket.

(Plac"o*derm) n. [Gr. tablet + skin.] (Paleon.) One of the Placodermi.

(Plac`o*der"mal) a. (Paleon.) Of or pertaining to the placoderms; like the placoderms.

(||Plac`o*der"ma*ta) n. pl. [NL.] (Paleon.) Same as Placodermi.

(||Plac`o*der"mi) n. pl. [NL., fr. Gr. a tablet + skin.] (Paleon.) An extinct group of fishes, supposed to be ganoids. The body and head were covered with large bony plates. See Illust. under Pterichthys, and Coccosteus.

(Plac`o*ga"noid) a. (Zoöl.) Pertaining to the Placoganoidei.

(||Plac`o*ga*noi"de*i) n. pl. [NL., fr. Gr. a tablet + NL. ganoidei. See Ganoidei.] (Zoöl.) A division of ganoid fishes including those that have large external bony plates and a cartilaginous skeleton.

(Plac"oid) a. [Gr. a tablet + -oid.] (Zoöl.) Platelike; having irregular, platelike, bony scales, often bearing spines; pertaining to the placoids.

(Plac"oid), n. (Zoöl.) (a) Any fish having placoid scales, as the sharks. (b) One of the Placoides.

(||Pla*coi"des) n. pl. [NL.] (Zoöl.) A group of fishes including the sharks and rays; the Elasmobranchii; — called also Placoidei.

(Pla*coid"i*an) n. (Zoöl.) One of the placoids.

(||Pla*coph"o*ra) n. pl. [NL., from Gr. tablet + to bear.] (Zoöl.) A division of gastropod Mollusca, including the chitons. The back is covered by eight shelly plates. Called also Polyplacophora. See Illust. under Chiton, and Isopleura.

(||Pla"ga) n.; pl. Plagæ [L. plaga a blow, a welt, a stripe.] (Zoöl.) A stripe of color.

(Pla"gal) a. [F., from Gr. sidewise, slanting.] (Mus.) Having a scale running from the dominant to its octave; — said of certain old church modes or tunes, as opposed to those called authentic, which ran from the tonic to its octave.

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