Definition of petasma in English:

petasma

noun

Zoology
  • A copulatory appendage attached to the first pair of pleopods in some male crustaceans, especially penaeid shrimps.

Pronunciation

petasma

/pɛˈtazmə/ /pɪˈtazmə/

Origin

Late 19th century. From ancient Greek πέτασμα something spread out, used by Aristotle of the feelers of the polypus from πεταννύναι to spread out + -σμα, extended form of -μα.