undulating

undulating (comparative more undulating, superlative most undulating)

1. Moving up and down like waves; wavy.
   • 1951 November, 'Pausanias', “To Greece by the "Simplon-Orient Express"”, in Railway Magazine, page 731:

     From Belgrade the train is hauled by a 2-10-0, and makes good time through undulating country, with vineyards and herds of woolly pigs, over single line to Nish, where the Sofia and Istanbul portion, including through coaches (until recently) from Prague to Sofia, the capital of Bulgaria, is detached.

   • 1960 February, J. N. Faulkner, “The Belgian Railways today”, in Trains Illustrated, page 86:

     The Borinage coalfield around Mons is another attractive area for the railway enthusiast; it is rather like South Lancashire, with its gently undulating landscape studded with slag heaps and pithead gear and criss-crossed by railway lines and tramways.

2. Forming a series of regular curves.

undulating

1. present participle and gerund of undulate

undulating (plural undulatings)

1. undulation
   • 1930, John Thomas Ingram Bryan, The Philosophy of English Literature, page 27:

     In good poetry every word and phrase, as Professor McKail says, reverberates like the sound of a lyre, and leaves after it numberless undulatings. The verse exhales sweet sound, and light-like thought, as perfumes do; but we cannot explain just why.