Part 656

Bip"e*dal (&?;), a. [L. bipedalis: cf. F. bipédal. See Biped, n.] 1. Having two feet; biped.

2. Pertaining to a biped.

Bi*pel"tate (&?;), a. [Pref. bi- + peltate.] Having a shell or covering like a double shield.

{ Bi*pen"nate (&?;), Bi*pen"na*ted (&?;), } a. [Pref. bi- + pennate: cf. L. bipennis. Cf. Bipinnate.] Having two wings. "Bipennated insects." Derham.

||Bi*pen"nis (&?;), n. [L.] An ax with an edge or blade on each side of the handle.

Bi*pet"al*ous (&?;), a. [Pref. bi- + petalous.] (Bot.) Having two petals.

||Bi`pin*na"ri*a (&?;), n. [NL., fr. L. bis twice + pinna feather.] (Zoöl.) The larva of certain starfishes as developed in the free-swimming stage.

{ Bi*pin"nate (&?;), Bi*pin"na*ted (&?;), } a. [Pref. bi- + pinnate; cf. F. bipinné. Cf. Bipennate.] Twice pinnate.

Bi`pin*nat"i*fid (&?;), a. [Pref. bi- + pinnatifid.] (Bot.) Doubly pinnatifid.

A bipinnatifid leaf is a pinnatifid leaf having its segments or divisions also pinnatifid. The primary divisions are pinnæ and the secondary pinnules.

Bip"li*cate (&?;), a. [Pref. bi- + plicate.] Twice folded together. Henslow.

Bi*plic"i*ty (&?;), n. The state of being twice folded; reduplication. [R.] Bailey.

Bi*po"lar (&?;), a. [Pref. bi- + polar. Cf. Dipolar.] Doubly polar; having two poles; as, a bipolar cell or corpuscle.

Bi`po*lar"i*ty (&?;), n. Bipolar quality.

{ Bi"pont (&?;), Bi*pont"ine } (&?;), a. (Bibliog.) Relating to books printed at Deuxponts, or Bipontium (Zweibrücken), in Bavaria.

Bi*punc"tate (&?;), a. [Pref. bi- + punctate.] Having two punctures, or spots.

Bi*punc"tu*al (&?;), a. Having two points.

Bi*pu"pil*late (&?;), a. [Pref. bi- + pupil (of the eye).] (Zoöl.) Having an eyelike spot on the wing, with two dots within it of a different color, as in some butterflies.

Bi`py*ram"i*dal (&?;), a. [Pref. bi- + pyramidal.] Consisting of two pyramids placed base to base; having a pyramid at each of the extremities of a prism, as in quartz crystals.

Bi*quad"rate (&?;), n. [Pref. bi- + quadrate.] (Math.) The fourth power, or the square of the square. Thus 4x4=16, the square of 4, and 16x16=256, the biquadrate of 4.

Bi`quad*rat"ic (&?;), a. [Pref. bi- + quadratic: cf. F. biquadratique.] (Math.) Of or pertaining to the biquadrate, or fourth power.

Biquadratic equation (Alg.), an equation of the fourth degree, or an equation in some term of which the unknown quantity is raised to the fourth power. -- Biquadratic root of a number, the square root of the square root of that number. Thus the square root of 81 is 9, and the square root of 9 is 3, which is the biquadratic root of 81. Hutton.

Bi`quad*rat"ic, n. (Math.) (a) A biquadrate. (b) A biquadratic equation.

Bi*quin"tile (&?;), n. [Pref. bi- + quintile: cf. F. biquintile.] (Astron.) An aspect of the planets when they are distant from each other by twice the fifth part of a great circle -- that is, twice 72 degrees.

{ Bi*ra"di*ate (&?;), Bi*ra"di*a`ted (&?;), } a. [Pref. bi- + radiate.] Having two rays; as, a biradiate fin.

Bi*ra"mous (&?;), a. [Pref. bi- + ramous.] (Biol.) Having, or consisting of, two branches.

Birch (brch), n.; pl. Birches (-z). [OE. birche, birk, AS. birce, beorc; akin to Icel. björk, Sw. björk, Dan. birk, D. berk, OHG. piricha, MHG. birche, birke, G. birke, Russ. bereza, Pol. brzoza, Serv. breza, Skr. bhrja. √254. Cf. 1st Birk.] 1. A tree of several species, constituting the genus Betula; as, the white or common birch (B. alba) (also called silver birch and lady birch); the dwarf birch (B. glandulosa); the paper or canoe birch (B. papyracea); the yellow birch (B. lutea); the black or cherry birch (B. lenta).

2. The wood or timber of the birch.