before a vowel tripl-, combining form repr. Gr. τριπλόος, τριπλοῦς threefold, triple; occurring in a few rare scientific terms. (Cf. TRIPLI-.) Triploblastic a., Biol. [Gr. βλαστός germ], having three germinal layers (epiblast, mesoblast, and hypoblast: cf. BLASTODERM) in the embryo; belonging to the division Triploblastica, a synonym of CŒLOMATA, including the majority of animals; cf. diploblastic s.v. DIPLO-. Triplo-caulescent, -caulous adjs., Bot. [L. caulis stem], having a tertiary system of axes or stem-branches. ǁ Triplopia, anglicized triplopy, Path. [Gr. ὤψ eye: cf. DIPLOPIA], an affection of the eyes in which objects are seen triple.
1888. Cassell’s Encycl. Dict., *Triploblastic.
1890. Billings, Med. Dict., Triploblastic, having three germ-layers.
1900. B. D. Jackson, Gloss. Bot. Terms, *Triplo-caulescent … when a plant has a third (tertiary) system of axes. *Triplocaulous … possessing ternary axes (Pax).
1860. Mayne, Expos. Lex., *Triplopia, a term for … disordered vision in which objects are tripled.
1903. F. W. H. Myers, Human Personality, I. 479. Cases, where ciliary spasm … led to … triplopia.
1863. Atkinson, trans. Ganot’s Physics, VII. vi. 463. A single eye may also be affected with *triplopy, but in this case the third image is exceedingly weak.
