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(). See Iso-. Is (), v. i.[AS. is; akin to G. & Goth. ist, L. est, Gr. , Skr. asti. 9. Cf. Am, Entity, Essence, Absent.] The third person singular of the substantive verb be, in the indicative mood, present tense; as, he is; he is a man. See Be. In some varieties of the Northern dialect of Old English, is was used for all persons of the singular. For thy is I come, and eke Alain. Chaucer. Aye is thou merry. Chaucer. The idiom of using the present for future events sure to happen is a relic of Old English in which the present and future had the same form; as, this year Christmas is on Friday. To-morrow is the new moon. 1 Sam. xx. 5. I"so- (), Is- ().} [Gr. 'i°sos equal.] A prefix or combining form, indicating identity, or equality; the same numerical value; as in isopod, isomorphous, isochromatic. Specif.: (a) (Chem.) Applied to certain compounds having the same composition but different properties; as in isocyanic. (b) (Organic Chem.) Applied to compounds of certain isomeric series in whose structure one carbon atom, at least, is connected with three other carbon atoms; -- contrasted with neo- and normal; as in isoparaffine; isopentane. スポンサード リンク
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