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microatoll
microatoll n. 
/ˌmʌɪkrəʊəˈtɒl/, /ˌmaɪkroʊˈæˌtɑl/, /ˌmaɪkroʊˈeɪˌtɔl/, /ˌmaɪkroʊˈeɪˌtɑl/ a circular growth of coral a few metres in diameter and with a central depression, such as is found in intertidal areas in warm seas and on the flats inside a coral reef.
Brit. /ˌmʌɪkrəʊˈatɒl/
, /ˌmʌɪkrəʊˈatɒl//ˌmʌɪkrəʊəˈtɒl/U.S. /ˌmaɪkroʊˈæˌtɔl/
, /ˌmaɪkroʊˈæˌtɔl//ˌmaɪkroʊˈæˌtɑl//ˌmaɪkroʊˈeɪˌtɔl//ˌmaɪkroʊˈeɪˌtɑl/ΘΚΠ
the world > animals > invertebrates > subkingdom Metazoa > grade Diploblastica > phylum Coelenterata > [noun] > class Anthozoa Actinozoa > member of > circular growth of
microatoll1933
1933 P. H. Kuenen in Snellius-Expedition Netherlands E. Indies V. ii. iii. 64 Conditions unfavourable to coral growth above low tide level certainly favour the formation of the micro-atolls.
1991 R. Goldring Fossils in Field ii. 31 (caption) Microatolls formed by the coral Porites in shallow water at Heron Island, Queensland, Australia.
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