before a vowel properly taut-, repr. Gr. ταὐτο-, combining form of ταὐτό, contraction of τὸ αὐτό, the same (cf. AUTO-); occurring in TAUTOLOGY, TAUTOMERISM, and their derivatives; also the following technical words, mostly of rare occurrence. Tautobaryd, Math. [irreg. f. Gr. βαρύς heavy], that curve upon which the pressure of a heavy particle moving under gravity is the same at every point (cf. TAUTOCHRONE). Tautographical a. [Gr. γραφικός descriptive], presenting the same geographical features throughout, monotonous in form. Tautohedral a., Cryst. [Gr. ἕδρα base], having the same face or side in common: see quot. Tautometric, Tautometrical adjs., Pros. [late Gr. ταὐτόμετρος, f. μέτρον measure], of the same meter; having the same arrangement of syllables in the verse, or occupying the same position metrically. Tautomorphous a., Cryst. [Gr. μορφή form], applied to a symmetrical form such that corresponding points or faces of it can be brought into congruence by revolution about an axis. Tautonym, Nat. Hist. [Gr. ταὐτώνυμ-ος a., f. ὄνυμα, ὄνομα name], a scientific name in which the same word is used for genus and specics; so Tautonymic a., pertaining to or constituting a tantonym; Tautonymy, the use of tautonyms. Tautoousian, -ious adjs., Theol. [f. eccl. Gr. ταὐτοούσιος (Epiphanius), f. οὐσία essence], having absolutely the same essence. † Tautopathy [Gr. ταὐτοπάθεια, f. πάθος suffering], suffering caused by the same thing as was habitually used previously. Tautophony [med. Gr. ταὐτοφωνία (Eustathius), f. φωνή voice], repetition of the same (vocal) sound; so Tautophonic, -ical adjs., repeating the same sound. Tautopody, Pros. [Gr. ταὐτοποδία, f. πούς, ποδ- foot], repetition of the same metrical foot; a double foot or dipody consisting of the same foot repeated twice; so Tautopodic a., belonging to or constituting a tautopody. Tautozonal a., Cryst., belonging to or situated in the same zone; hence Tautozonality, the quality of being tautozonal.
1891. Cent. Dict., *Tautobaryd.
1860. Temple Bar Mag., I. 121. Syria is the most wearying, sun-baked, *tautographical place in the world,… blinding limestone ridges, limestone mule-paths, limestone valleys, limestone everything and everywhere.
1895. Story-Maskelyne, Crystallogr., iii. § 36. When two zones have a face in common, that is to say when their zone-circles intersect in a pole, they will be spoken of as *tautohedral in that face or pole.
1894. Fennell, in Class. Rev., Feb., 49/1. *Tautometric responsion of single words is as a rule without significance and may sometimes be due to chance.
1892. Athenæum, 16 July, 92/1. Mr. Bury has either failed to detect, or neglected to notice,… κεινοῦ σὺν ἀνδρός, V. 9, *tautometrical with ἀνδρὸς φιλοξείν-, V. 20.
1895. Story-Maskelyne, Crystallogr., vi. § 150. It is not difficult to determine whether in any particular case correlative mero-symmetrical forms are enantiomorphous or *tautomorphous; i.e. cannot be brought into congruence, or can be so brought by revolution round one or more zone-lines.
1901. Ibis, Oct., 722. We cannot agree with Señor Berg that everyone ought to call … the Night-Heron Nycticorax nycticorax, for we do not ourselves recognise the obligations of the new system of *tautonyms. Ibid. (1896), July, 364. This repeating of the specific name seems specially awkward in the cases of the unavoidable *tautonymic names.
1908. Athenæum, 18 March, 342/1. He concluded with a proposal to get rid of *tautonymy-as in Trutta trutta, Apus (Apus) apus, or other comical arrangements—by a plan distinguishing what was legal in the past from what is to be legal in the future.
[1678. Cudworth, Intell. Syst., I. iv. § 36. 611. That the ancient orthodox fathers, who used the word Homoousias against Arius, intended not therein to assert the Son to have one and the same singular or individual essence with the Father, appeareth plainly from their disclaiming and disowning those two words, ταυτοούσιον and Μονοούσιον. Concerning the former of which, Epiphanius thus;… ‘We affirm not the Son to be Tautoousion, (one and the same substance with the Father) lest this should be taken in any way of compliance with Sabellius.’) Ibid. Athanasius … disclaimeth a monoousian Trinity, as Epiphanius did before a *tautoousian; both of them a Trinity of meer naines … they alike distinguishing them from the homoousian Trinity, as a Trinity of real Hypostases or Persons.
1846. Worcester, Tautoöusian, *Tautoöusious, having the same identical essence.
1882. Ogilvie, Tautoöusian, same as Tautousian…. Tautousian, Tautousious, in theol. having absolutely the same essence.
1652. N. Culverwell, Treat., I. xvii. (1661), 152. Anacreon … by a most emphatical *Tautopathy, was choak’d with the husk … of a Grape.
1847. Webster, *Tautophonical … *Tautophony.
1881. G. W. Moon, Revisers’ Eng., xxiv. (1882), 64. They say ‘That ye may be sons of your Father which is in heaven: for he maketh his sun to rise’ … tautophony, suggestive of a pun.
1898. F. Harrison, in 19th Cent., June, 942. If your ear does not hear the false note, the tautophony or the cacophony in the written sentence as you read it.
1891. Cent. Dict., *Tautopodic … *Tautopody.
1878. Gurney, Crystallogr., 21. They are also said to be *tautozonal, by which is meant that they all lie in one and the same zone.
1895. Story-Maskelyne, Crystallogr., iii. § 36. Two or more poles (or their faces) are said to be tautozonal or heterozonal with a third, according as they lie in the same or different zone-circles (or zones) with it.
1880. L. Fletcher, in Philos. Mag., Feb., 84. The property of *tautozonality is a permanent one.
