A Grammatical Dictionary of Botanical Latin

Theory, a philosopic speculation: theoria,-ae (s.f.I), abl. sg. theoria [> Gk. theOria]; also theorice,-es (s.f.I) [> Gk. TheOrikE, a philosophic speculation];

- theoriam de identitate utriusque organorum generis jamdiu relictam fuisse post opera tot recentiora credere licuisset quum sub nova forma et novis argumentis fundatam in opere recentissimo Decaisnei denuo resurgentem invenimus (Agardh), for a long time now it had been allowable, after so many more recent works, to believe that the theory regarding the identity of both organs of the genera to have been abandoned, when we came upon it reappearing anew under a new form and founded on new arguments in the most recent work of Decaisneus.

Theoria,-ae (s.f.I) strobiloidea: “the assumed origin of Pteridophytes, in those forms whose sporophytes are the most primitive, as Lycopodium and Equisetum (Bower)” (Jackson).

Theory, knowledge, art: see ars, gen. sg. artis (s.f.III).