Definition of univalve in English:

univalve

adjective

Zoology
  • Having one valve or shell.

    • ‘In the earliest Cambrian, one lineage developed a bivalved mineralized shell (Fordilla and its relatives), the other an endogastric univalve shell (the Helcionellids).’
    • ‘Vetustovermis bears a number of morphological features that are found in Kimberella, which has been interpreted to have a non-mineralized but stiff univalve shell.’

noun

Zoology
  • another term for gastropod
    • ‘This univalve bonds tightly to the shell and rarely moves; over time, the crab ends up with a stack of many generations of slipper shells.’
    • ‘Now explain how a univalve differs from a bivalve, in more ways than just the number of shells.’
    • ‘But who speaks out for the univalve and the bivalve?’
    • ‘Thus, all rostroconches and some helcionellacean univalves technically become stem group bivalves.’

Pronunciation:

univalve

/ˈyo͞onəˌvalv/