Aa

Named to always appear first in alphabetical listings; or alternatively after Pieter van der Aa.

Aa f

1. A taxonomic genus within the family Orchidaceae – a group of orchids of cool climates in Latin America.

• (genus): Eukaryota - superkingdom; Plantae - kingdom; Viridiplantae - subkingdom; Streptophyta - infrakingdom; Embryophyta - superphylum; Tracheophyta - phylum; Spermatophytina - subphylum; angiosperms, monocots - clades; Asparagales - order; Orchidaceae - family; Orchidoideae - subfamily; Cranichideae - tribe; Cranichidinae - subtribe

• (genus): Aa paleacea - type species; for other species see Aa at The Plant List.

• Aa (plant) on Wikipedia.Wikipedia
• Aa (Orchidaceae) on Wikispecies.Wikispecies
• Aa (Orchidaceae) on Wikimedia Commons.Wikimedia Commons
• Aa at the Catalogue of Life 
• Aa at Encyclopedia of Life
• Aa at National Center for Biotechnology Information
• Aa at The Plant List

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Aa f

1. A taxonomic subgenus within the family Euconulidae – a group of snails.

• (subgenus): Euconulidae - family; Microcystinae - subfamily; Philonesia - genus

• (subgenus): For species see Aa (ICZN) on Wikispecies.Wikispecies

• Aa (ICZN) on Wikispecies.Wikispecies

From Proto-Germanic *ahwō (“waters, river”), from Proto-Indo-European *h₂ekʷeh₂ (“water”); both natively, and through Dutch Low Saxon Aa and German Low German Aa (both from Old Saxon aha (“stream”)), and German Aa (from Old High German aha (“stream”)). For more information, see its cognate English ea.

• IPA^(key): /aː/

• Audio

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• Hyphenation: Aa
• Rhymes: -aː

Aa f

1. the name of many small rivers and streams

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• IPA^(key): /ˌaˈʔa/

Aa n (genitive Aas, no plural)

1. (childish) poo, poop (faeces)

• Aa machen

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• IPA^(key): /aː/

Aa f (genitive Aa)

1. any of several rivers in Germany

Aa

1. A surname​.