sauropod

noun

1. Any of the extinct clade †Sauropoda of long-necked dinosaurs which walked on four thick, pillar-like legs.

   “His most memorable work is an illustrated compendium of dinosaurian copulatory positions - a sort of reptilian Kama Sutra - that includes a “leg over” manoeuvre by the sauropods, the largest dinosaurs of all - that many consider highly dubious.”