RIA Definition

rēə, rēä
abbreviation
Radioimmunoassay.
American Heritage Medicine
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noun
A long, narrow, wedge-shaped inlet, uniformly widening and deepening toward the sea.
Webster's New World

A submergent coastal landform, often known as a drowned river valley.

Wiktionary
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Other Word Forms of RIA

Noun

Singular:
RIA
Plural:
rias

Origin of RIA

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RIA