Origin ofperiod1 First recorded in 1375–1425;late Middle Englishperiode,fromMiddle French,fromMedieval Latinperiodus,fromLatin,fromGreekperíodos“circuit, length of time,” literally, “way around”; equivalent toperi-+-ode2 Discover More
Noun1. Permian period- from 280 million to 230 million years ago; reptiles Permian Paleozoic,Paleozoic era- from 544 million to about 230 million years ago Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc. ...
1. =way,表示"路,走"; 2. 表示"电极" adj. periodic周期的, 定期的 period周期+ic……的→adj.周期的, 定期的 n. anode[电]阳极, 正极 an上+ode电极→n.[电]阳极, 正极 cathode[电]阴极,负极 cath下+ode电极→n. [电]阴极,负极 diode二极管 ...
Here are 10 potential reasons for a late or skipped period that might cause you to be irregular. Always check in with your doctor to confirm a pregnancy or to help identify if you are having a medical issue. 1. Pregnancy If you’re sexually active and have reached puberty, a missed or ...
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Conodonts(recently recognized as toothlike elements of veryprimitiveeel-like vertebrates) are abundant in many Devonian marine facies. Conodonts had perhaps their greatest diversification during the Late Devonian and are of major importance for the correlation of rock layers. More than 40conodontzones ...
• Within this period, the most significant day is Christmas Eve.• A five-day waiting period is required to purchase a handgun.• black immigration into Britain during the post-war period• The money can be paid back over a five-year period....
Although there was some variation in the schedule of patching used (exemplifying the limitations of a retro spective analysis) the normal protocol was of two to three hours total occlusion per day. Inclusion criteria A lower age limit of 36 months was imposed to allow linear visual acuity ...
The first major stone tomb sculpture in China was created in the Han period, and lifelike clay figurines of people and animals also appeared. In the Xi Han, bronzework continued the style of the late Zhou period and often was inlaid with silver and gold. Bronze vessels were made both for...
1 Therefore, an expected menstrual cycle is said to actually range from anywhere between 21 and 35 days.2 Your menstrual cycle also has four distinct phases: What are irregular periods? Irregular periods can be anything that doesn’t fit the ‘normal’ expected pattern of a 21‒35-day ...