clock face: the face of a clock showing hours and minutes of the day
face: the side upon which the use of a thing depends (usually the most prominent surface of an object)
onychophora: enigmatic small elongated wormlike terrestrial invertebrates of damp dark habitats in warm regions; distinct from the phylum Annelida; resemble slugs with legs and are sometimes described as the missing link between arthropods and annelids