nycthemeraladj.

Brit.

/nɪkˈθɛm(ə)rəl/,

/nɪkˈθɛm(ə)rl̩/, U.S.

/ˌnɪkˈθɛm(ə)r(ə)l/

Forms: 1900s– nychthemeral, 1900s– nycthemeral.

Origin: Formed within English, by derivation. Etymons: nycthemeron n., -al suffix¹.

Etymology: < nycthemer- (in nycthemeron n.) + -al suffix¹. Compare French nyctéméral (1890), nycthéméral (1897). Compare also nyctohemeral adj.For the variation in forms see etymological note at nycthemeron n.

Chiefly Biology and Physiology.

Designating or characterized by a variation that occurs in a period of twenty-four hours, esp. corresponding to the contrast between day and night.

ΘΚΠ

the world > time > change > [adjective] > changing or undergoing alteration > within 24-hour cycle

nycthemeral1907

1907 Nature 17 Jan. 287/2 The regulation of the nychthemeral cycle of temperature and its inversion in the aged.

1967 Oceanogr. & Marine Biol. 5 495 These nycthemeral changes of the gas tension in the different levels of water.

1974 Nature 13 Sept. 143/2 These animals have a nychthemeral variation of less than 2° C.

1990 Acta Zoologica Fennica 190 279 (title) Nycthemeral activity rhythm of adult Clubiona corticalis.

This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022).

单词	nycthemeral
释义	nycthemeraladj. Brit. /nɪkˈθɛm(ə)rəl/, /nɪkˈθɛm(ə)rl̩/, U.S. /ˌnɪkˈθɛm(ə)r(ə)l/ Forms: 1900s– nychthemeral, 1900s– nycthemeral. Origin: Formed within English, by derivation. Etymons: nycthemeron n., -al suffix¹. Etymology: < nycthemer- (in nycthemeron n.) + -al suffix¹. Compare French nyctéméral (1890), nycthéméral (1897). Compare also nyctohemeral adj.For the variation in forms see etymological note at nycthemeron n. Chiefly Biology and Physiology. Designating or characterized by a variation that occurs in a period of twenty-four hours, esp. corresponding to the contrast between day and night. ΘΚΠ the world > time > change > [adjective] > changing or undergoing alteration > within 24-hour cycle nycthemeral1907 1907 Nature 17 Jan. 287/2 The regulation of the nychthemeral cycle of temperature and its inversion in the aged. 1967 Oceanogr. & Marine Biol. 5 495 These nycthemeral changes of the gas tension in the different levels of water. 1974 Nature 13 Sept. 143/2 These animals have a nychthemeral variation of less than 2° C. 1990 Acta Zoologica Fennica 190 279 (title) Nycthemeral activity rhythm of adult Clubiona corticalis. This entry has been updated (OED Third Edition, March 2004; most recently modified version published online March 2022). < adj.1907
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