noun
bank; shoal; elevation in the seabed
Geological term for a submerged elevation in the sea, often used in oceanography and marine geology.
この海域にはいくつかの堆が点在している。
Several banks are scattered in this sea area.
noun
Obsolete term for a pile or heap; not used in modern Japanese. Replaced by words like 山 (やま) or 積み重ね (つみかさね).
古文書には、石の堆と記されている。
In old documents, it is written as a pile of stones.
Common word for a pile or heap, unlike the obsolete 堆.
Modern noun for a stack or pile, replacing the obsolete sense of 堆.
The kanji 堆 originally means 'pile' or 'heap' in Chinese, and the obsolete Japanese sense reflects that. The geological sense is a modern specialized usage.