ordinal

adj (of a number) showing order or position in a series （指数字）序数的. > ordinal n (also ,ordinal `number): `First', `second' and `third' are ordinals. 第一、 第二、 第三都是序数词. =>App 4 见附录4. Cf 参看 cardinal1.

orbital, orch, orchard, orchestra, orchestra pit, orchestra stalls (US orchestra), orchestral, orchestrate, orchestration, orchid, ordain, ordeal, order, order-book, order-form, order-paper, ordered, ordering, orderliness, orderly, ordinance, ordinarily, ordinary, ordinary level (also O level), ordinary seaman, ordination, ordnance, Ordnance Survey, ordure, ore, organ, organ-grinder, organ-loft, organdie (US also organdy), organic, organic chemistry, organically, organically-grown, organisation, organise,