1. One of the often brightly coloured and branching hornlike structures on the back of the nudibranch (and other related mollusks) that serve as gills

Type of: branchia, gill

• haplo-
• haploid
• haploidic
• haploidy
• haplology
• Haplopappus
• Haplopappus acaulis
• Haplopappus phyllocephalus
• Haplopappus spinulosus
• Haplosporidia
• haplosporidian
• haplotype
• haply
• happen
• happen upon
• happening
• happenstance
• happily
• happiness
• happy
• happy chance
• happy event
• happy hour
• happy-clappy
• happy-go-lucky