thalass(o)-, thaˈlassi(o)-|θəˈlæs(əʊ|from Gr. θάλασσα sea, and θαλάσσι-ος marine, formative elements of learned words. thalaˈssarctinea.Zool.[Gr. ἄρκτ-ος a bear], of or pertaining to the Polar Bear, Thalassarctos. thalassiˈcollidan[Gr. κόλλα glue], a. belonging to the Thalassicollidæ, a family of single-celled radiolarians; n. a radiolarian of this family. thaˈlassio-, thaˈlassophyte[-phyte], a plant of the Thalassiophyta(seequot.); a seaweed, a marine alga; hence thalassiˈophytousa., belonging to the Thalassiophyta. thalaˈssometer[-meter], a tide-gauge. thalassomeˈtriciannonce-wd., one who measures the sea. thalaˈssophilousa.[-phil], fond of the sea, living in the sea. thalassoˈphobia, a morbid dread of the sea. thalassoˈtherapy: see quot. 1899. See also thalassocracy, etc.1842Penny Cycl. XXIV. 277/1 *Thalassiophytes..is the name given by Lamouroux to designate the vegetable productions of the ocean... It is equivalent to the term Hydrophytes of Lingbye, and the..Marine Algæ.1900B. D. Jackson Gloss.Bot. Terms, Thalassophyte.1858Simmonds Dict. Trade, *Thalassometer, a tide-gauge.1652Needham tr.Selden's Mare Cl. 5, I have heard of a Geometrician, or one that could measure Land; but never of a *Thalassometrician, one that could measure or lay out Bounds in the Sea.1891Cent.Dict., *Thalassophilous.1897tr.Ribot's Psychol. Emotions ii. ii. 213 Every morbid manifestation of fear is immediately fitted with a Greek designation,..and we have aïcmophobia, belenophobia, *thalassophobia, potamophobia, etc.1899Syd. Soc.Lex., *Thalassotherapy, treatment of disease by sea bathing, sea voyages, etc.1910Index-Catal. Libr. Surgeon-General's Office, U.S. Army 2nd Ser. XV. 362/1 Nyström (O.E.) Några ord om hafskuren eller thalassotherapien. (A few words on sea-baths and thalassotherapy.) 8°. Göteborg, 1907.1966Punch 5 Oct. 531 Thalassotherapy is sea-bathing in a warm, enclosed and controlled area... Pure sea water is pumped in from several hundred metres out.1983Inglis & West Alternative Health Guide 25 Establishments which provide thalassotherapy have been springing up around the continent of Europe..to provide a holiday in which the usual seaside ingredients..are supplemented..by a regime of salt-water treatments.