| twain | Two;- nearly obsolete in common discourse, but used in poetry and burlesque. "Children twain." "And whosoever shall compel thee to go a mile, go with him twain." (Matt. V. 41) In twain, in halves; into two parts; asunder. "When old winder split the rocks in twain." (Dryden) Twain cloud. <astronomy> Same as Cumulo-stratus. Origin: OE. Twein, tweien, tweyne, AS. Twegen, masc. See Two. Source: Websters Dictionary (01 Mar 1998) |
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| twaite | <zoology> A European shad; called also twaite shad. See Shad. Origin: Prov. E. Source: Websters Dictionary (01 Mar 1998) |
| twattle | To prate; to talk much and idly; to gabble; to chatter; to twaddle; as, a twattling gossip. Origin: Cf. Tattle, Twaddle. Source: Websters Dictionary (01 Mar 1998) |
| twayblade | <botany> Any one of several orchidaceous plants which have only two leaves, as the species of Listera and of Liparis. Alternative forms: twyblade. Source: Websters Dictionary (01 Mar 1998) |
| Tweed edgewise treatment | See: edgewise appliance. (05 Mar 2000) |
| Tweed triangle | A triangle defined by facial and dental landmarks on a lateral cephalometric film, using the Frankfort horizontal plane as a base and intended for use as a guide in the evaluation and planning of orthodontic treatment. (05 Mar 2000) |
| Tweed, Charles | <person> U.S. Orthodontist, 1895-1970. See: Tweed edgewise treatment, Tweed triangle. (05 Mar 2000) |
| tweezers | An instrument with pincers that are squeezed together to grasp or extract fine structures. Origin: A.S. Twisel, fork (05 Mar 2000) |
| twelfth cranial nerve | <anatomy, nerve> The hypoglossal nerve enervates the muscles of the tongue. Lesions of the twelfth cranial nerve result in deviation of the tongue toward the paralysed side and thick speech. Synonym: cranial nerve XII. (27 Sep 1997) |
| twelfth-second | <physics> A unit for the measurement of small intervals of time, such that 10^12 (ten trillion) of these units make one second. Source: Websters Dictionary (01 Mar 1998) |
| twelfth-year molar | The second permanent molar tooth. (05 Mar 2000) |
| twelve | 1. The number next following eleven; the sum of ten and two, or of twice six; twelve units or objects; a dozen. 2. A symbol representing twelve units, as 12, or xii. The Twelve, the twelve apostles. Source: Websters Dictionary (01 Mar 1998) |
| twenty-fourmo | Having twenty-four leaves to a sheet; as, a twenty-fourmo form, book, leaf, size, etc. A book composed of sheets, each of which is folded into twenty-four leaves; hence, indicating more or less definitely a size of book whose sheets are so folded; usually written 24mo, or 24 deg . Source: Websters Dictionary (01 Mar 1998) |
| twenty-nail dystrophy | Longitudinal ridging of all of the nails; seen in alopecia areata and lichen planus. (05 Mar 2000) |
| twice | 1. Two times; once and again. "He twice essayed to cast his son in gold." (Dryden) 2. Doubly; in twofold quantity or degree; as, twice the sum; he is twice as fortunate as his neighbor. Twice is used in the formation of compounds, mostly self-explaining; as, twice-horn, twice-conquered, twice-planted, twice-told, and the like. Origin: OE. Twies (where the s is the adverbial ending; see -wards), twie, AS. Twiges, twiwa; akin to twi- (in comp) two, G. Zwie-, OHG. Zwi-, Icel. Tvi-, L. Bi-, Gr, Skr. Dvi-, and E. Two. See Two. Source: Websters Dictionary (01 Mar 1998) |