biconic a. [L. bis, two; Gr. konos, cone] Being formed as two cones placed base to base.
biconvex a. [L. bis, two; convexus, arched outward] Being convex on opposite sides; lens-shaped. see amphicyrtic, amphicoelous.
bicorn a. [L. bis, two; cornu, horn] Bearing two horns; cres centlike.
bicornuate a. [L. bis, two; cornutus, horned] Having two horns or cephalic processes.
bicornuate uterus A uterus in which both uteri are fused, but have short lateral extensions.
bicron see nanometer bicuspidate a. [L. bis, two; cuspidatus, pointed] Being double pointed; having two cusps or points.
bidactyl n. [L. bis, two; Gr. daktylos, finger] (ARTHRO) An appendage, ambulacrum, apotele, or claw with two lateral ungues. see monodactyl, tridactyl.
bideficiency n. [L. bis, two; deficare, to be wanting] A form of phanerotaxy, exhibited by the absence of two of the elements typically present in a particular organism. see holotaxy.
bidentate a. [L. bis, two; dens, tooth] Having two teeth.
bidenticulate a. [L. bis, two; dim. dens, tooth] Having two small teeth or tooth-like processes.
bidesmatic a. [L. bis, two; Gr. desmos, bond] Pertaining to two tendons attached at the base of the distal segment of an appendage; a eudesmatic articulation.
bidiscoidal a. [L. bis, two; Gr. diskos, circular plate; eidos, form] Having two disc-shaped parts.
bidiverticulate a. [L. bis, two; devertere, to turn away] Having two diverticula.
biemarginate a. [L. bis, two; emarginatus, notched at the apex] Having two notches on the border or edge.
biennial a. [L. bis, two; annus, year] Occurring once every two years.
bifacial a. [L. bis, two; facies, face] Having opposite surfaces alike.
bifarious a. [L. bis, two; fariam, in rows] Being arranged in 2 rows, on either side of an axis; being oriented or pointed in opposite directions.
bifasciate a. [L. bis, two; fascia, band] With two broad well defined bands or fascia.
bifenestrate a. [L. bis, two; fenestra, window] (NEMATA: Se-cernentea) A term used to describe heteroderid fenestra divided by a broad vulval bridge so that it appears to be two distinct semi-fenestra. see ambifenestrate.
bifid a. [L. bis, two; findere, to split] Divided into two branches, arms, or prongs, or into two equal parts by a cleft; separated down the middle by a slit; divided by a groove into two parts.
bifilar a. [L. bis, two; filum, thread] Having two filaments, threads, or fibers.
biflabellate a. [L. bis, two; flabellum, fan] (arthro) Twice fa-bellate; a form of antenna with each side of the joints having long flattened processes.
biflagellate a. [L. bis, two; flagellum, whip] Having two flagella; dikont.
biflex a. [L. bis, two; flectere, to bend] Bending in two directions.
bifoliate colony (BRYO: Stenolaemata) An erect colony formed by two layers of zooids budding back to back from the interior multizooidal median wall.
bifollicular a. [L. bis, two; folliculus, small sac] Having two follicles.
biforate a. [L. bis, two; forare, to bore] Having two perforations.
biform a. [L. bis, two; forma, form] Having two forms, or combining characteristics of two forms.
biformes n. [L. bis, two; forma, form] (ARTHRO: Crustacea) A carapace that reflects sexual dimorphism in differing valve proportions for each sex of the same species.
biforous spiracle (ARTHRO: Insecta) An immature's spiracle having two entrances (air tubes); annular-biforous spiracles.
bifurcate a. [L. bis, two; furca, fork] Divided into two branches, stems or knobs; two pronged.
bigeminal a. [L. bis, two; geminus, twin] Doubled; paired.
bigener n. [L. bis, two; genus, kind] A bigeneric hybrid.
bigeneric a. [L. bis, two; genus, kind] Pertaining to hybrids between species of different genera.
bigiceriate, bigigeriate a. [L. bis, two; gigerium, entrail] Having two gizzards.
biguttate a. [L. bis, two; gutta, drop, spot] Having two droplike spots.
bijugate a. [L. bis, two; jugum, yolk] Being yoked two together; two-paired.
bilabiate spiracle (ARTHRO: Insecta) An elongate or annular spiracle of certain larvae with a pair of projecting lips interior to the peritreme; one having two lips at the slit-like entrance.
bilamellar a. [L. bis, two; lamella, plate] Having two lamellae or plates; two-lipped.
bilaminar a. [L. bis, two; lamina, thin plate] Consisting of two lamina or thin plates; diploblastic.
bilaminate colony (BRYO: Gymnolaemata) A cheilostomate colony with erect branches comprised of two layers of zo-oids, each with separate, but common exterior basal walls.
bilateral a. [L. bis, two; latus, side] Having two equal or symmetrical sides.
bilateral cleavage That in which the blastomeres exhibit marked bilateral symmetry.
Bilateralia, Bilatera A former division of the animal kingdom containing all those forms that show bilateral symmetry.
bilateral symmetry Symmetry such that a body or part can be divided through the longitudinal axis by one mediosag-ittal plane into equivalent right and left halves, each for all practical purposes a mirror image of the other. see radial symmetry.
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