"involving a 24-hour period. The word is an illegitimate neologism, coined in the absence of need; where daily will not do, owing to suggestion of daytime occurrennce, yncthemeral will, and is of respectable antiquity and regularly formed." 
- . Glossarial Index. In: Acoustic Behavior of Animals. Acoustic Behavior of Animals. Elsevier; 1963.
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