Plural of alula; the small feathered digits on multiple birds' wings.
Latin plural of alula, following standard Latin grammatical rules for feminine nouns ending in -a, changing to -ae in plural.
The plural 'alulae' is such specialized vocabulary that most English speakers will never say it, but ornithologists use it constantly to describe precise bird wing anatomy.
Complete word intelligence in one call. Free tier — 50 lookups/day.