aa

C2+ Topic:General Vocabulary

US /ˈɑːɑː/ UK /ˈɑːɑː/ See IPA manual

Meanings

1

noun
basaltic lava with a rough, jagged, clinkery surface

The geologists picked their way carefully across the sharp aa flow.

Thesaurus

Synonyms

1 noun · basaltic lava with a rough,... lava clinker

Opposites

pahoehoe

Word family

Related forms pahoehoe

Etymology

From Hawaiian ʻaʻā ('rough lava, to burn, blaze'). Adopted as a geological term for blocky, jagged basaltic lava, in contrast to the smooth pahoehoe.

ʻaʻā Hawaiian

View etymology graph ->

Topics

General Vocabulary

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# aa

**Type:** Word
**Level:** C2+
**Part of speech:** noun
**IPA (US):** /ˈɑːɑː/
**IPA (UK):** /ˈɑːɑː/

## Meanings
1. basaltic lava with a rough, jagged, clinkery surface

## Examples
- The geologists picked their way carefully across the sharp aa flow.

## Synonyms
- lava
- clinker

## Antonyms
- pahoehoe

## Related Forms
- pahoehoe

## Roots and Affixes
- Root: ʻaʻā

## Etymology
From Hawaiian ʻaʻā ('rough lava, to burn, blaze'). Adopted as a geological term for blocky, jagged basaltic lava, in contrast to the smooth pahoehoe.

## AI Etymology
aa comes from Hawaiian ʻaʻā ('rough lava, to burn, blaze'). Adopted as a geological term for blocky, jagged basaltic lava, in contrast to the smooth pahoehoe. The path is chiefly one of transmission: an older form is taken into English, with the word's shape and meaning carried through the language names and forms preserved in the history. In modern use, the noun sense is "basaltic lava with a rough, jagged, clinkery surface", which keeps the etymology connected to the word's present dictionary value rather than treating it as a merely historical label. The wider word family includes related English forms such as pahoehoe, showing how the same base continues to support neighboring English vocabulary. The principal historical forms in the chain include Hawaiian ʻaʻā, which anchor the explanation in named linguistic material.

## Topics
- General Vocabulary

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aa

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