WordNet

an object shaped like an equilateral triangle
a low triangular area of alluvial deposits where a river divides before entering a larger body of water; "the Mississippi River delta"; "the Nile delta"
the 4th letter of the Greek alphabet
any specific behavior; "they avoided all recreational activity"
(chemistry) the capacity of a substance to take part in a chemical reaction; "catalytic activity"
relating to the crystallization of a compound in two or more different forms; "polymorphous crystallization" (同)polymorphic

PrepTutorEJDIC

デルタ(ギリシア語アルファベットの第4字Δ,δ;英語D,dに相当) / (河口の)三角州,デルタ / 三角形をしたもの
〈U〉『活動』,働き;活力 / 《しばしば複数形で》(種々の)『活動』,行事;(学生の)学内(外)活動,クラブ活動 / 〈U〉(商況・市場などの)活発,活気
多形の,多様な

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1. 痙攣発作およびてんかんの診断における脳波検査（EEG）electroencephalography eeg in the diagnosis of seizures and epilepsy [show details]
…prognosis . Temporal intermittent rhythmic delta activity (TIRDA) is a particular form of focal slowing (and a subtype of lateralized rhythmic delta activity [LRDA]; see next paragraph) that is specific …
2. 小児や青年による「窒息ゲーム」およびその他の首絞め行動the choking game and other strangulation activities in children and adolescents [show details]
…with initial slowing of the background on electroencephalogram (EEG), followed by high-amplitude delta activity . Loss of consciousness, with flattening of the EEG background, occurs if hypoperfusion and hypoxia…
3. 脳幹の前兆を伴う片頭痛（脳底型片頭痛）migraine with brainstem aura basilar type migraine [show details]
…Prolonged impairment of consciousness (greater than two weeks) with marked generalized slow-wave delta activity has been reported in one patient with MBA . Specific brainstem localizing syndromes (eg, Wallenberg…
4. 骨髄性プロトポルフィリン症およびX連鎖優性プロトポルフィリン症erythropoietic protoporphyria and x linked protoporphyria [show details]
…with EPP or XLP were regarded as having sensitivity to sunlight of unknown cause. Polymorphous light eruption – Polymorphous light eruption (PMLE; sometimes called "sun poisoning" or "sun allergy") is a common …
5. 痙攣発作およびてんかんの診断におけるビデオおよび携帯型24時間EEGモニタリングvideo and ambulatory eeg monitoring in the diagnosis of seizures and epilepsy [show details]