aa

aa · noun¹

1. Proto-Polynesian*kaha
2. Proto-Polynesian*kakaha
3. Hawaiianʻaʻā
4. English todayaa

Borrowed from Hawaiian ʻaʻā.

aa · noun, adjective²

Abbreviation.

aa · noun³

Compare pp.

aa · adjective⁴

Contraction.

AA · noun, proper noun, adjective, verb⁵

Abbreviations.

Aa · proper noun⁶

1. Proto-West Germanic · derived from*ahu“river”
2. English todayAa

The river names are ostensibly from Proto-West Germanic *ahu (“river”).

Words from the same roots

First known use, by meaning

• From 19ᵗʰ c. A form of lava flow associated with Hawaiian-type volcanoes, consisting of basaltic rock, usually dark-colored with a jagged and loose, clinkery surface. Compare pahoehoe.