ˌ ̷ ̷ ̷ ̷ˈkēnə noun
Usage: capitalized
Etymology: New Latin, from gastr- + -chaena (from Greek chainein to yawn, gape) — more at yawn
: a genus of bivalve mollusks (order Eulamellibranchia) that bore in coral, soft rock, or hardened mud and have long siphons and a widely gaping shell