All articles starting with D

Drop tank

A drop tank, also called a jettisonable or external fuel tank, is an auxiliary tank carried on an aircraft's hardpoints and dropped to extend range.

Drop test

A drop test is a reliability test in which a product or package is dropped from a set height to evaluate its resistance to impact and shock damage.

Drop tower

The drop tower, or freefall tower, is an amusement ride that lifts a gondola of riders up a vertical tower, releases them into free fall, and brakes them.

A drop-in biofuel is a bio-derived liquid fuel chemically interchangeable with the petroleum fuel it replaces, so it blends into existing engines and infrastructure without modification, chiefly as aviation fuel.

Drop-off system

The drop-off system, also called the marker system, is a navigation method for group motorcycle rides in which a rotating rider stops at each turn to point the way.

Drop-seq

Drop-seq is a droplet microfluidic single-cell RNA sequencing method introduced in 2015 that co-encapsulates cells with DNA-barcoded beads in nanoliter droplets, profiling thousands of cells at a cost of pennies per cell.

Dropbox

Dropbox, once incorporated as Evenflow, Inc., is a San Francisco cloud file storage service founded in 2007, public since 2018, with over 700 million registered users.

Droperidol

Droperidol is a butyrophenone derivative and potent dopamine D2 receptor antagonist used as an antiemetic and antipsychotic, mainly against postoperative nausea and vomiting and for rapid tranquilization.

Dropkick Murphys

Dropkick Murphys, Celtic punk band formed in 1996 in the Boston area (Quincy/South Boston) by Ken Casey, Mike McColgan, and Rick Barton; known for "I'm Shipping Up to Boston," Hellcat Records debut Do or Die, the Claddagh Fund, and labor and political activism.

Sep 19, 2026

Droplet Biosciences

Droplet Biosciences is a liquid-biopsy diagnostics company in Cambridge, Massachusetts, founded in 2021, whose LymphDetect test measures ctDNA in surgical drain fluid to predict cancer recurrence.

Droplet countercurrent chromatography

Droplet countercurrent chromatography (DCCC) is an all-liquid chromatography technique, introduced in 1970, in which mobile-phase droplets pass through a stationary liquid under gravity to separate natural products.

Droplet digital PCR

Droplet digital PCR (ddPCR) is a nucleic acid quantification method that partitions a PCR reaction into thousands of oil droplets, giving absolute DNA counts without standard curves.

Droplet-based microfluidics

Droplet-based microfluidics is a method that generates and manipulates micron-scale droplets of one liquid inside an immiscible carrier fluid, enabling massively parallel, time-resolved experiments in isolated microreactors.

Droplet-network synthetic tissues

Droplet-network synthetic tissues are engineered materials built from aqueous droplets acting as cell-like compartments, joined by lipid bilayers that let them communicate chemically and electrically.

Dropleton

The dropleton is a charge-neutral quasiparticle made of four or more electrons and holes that jostles like a tiny liquid droplet, first observed in 2014 in gallium arsenide quantum wells and lasting about 25 picoseconds.

Dropout (neural networks)

Dropout is a regularization technique for training neural networks that randomly removes units and their connections at each step to reduce overfitting, introduced by Geoffrey Hinton and colleagues in 2012.

Dropped ceiling

A dropped ceiling, also known as a suspended or false ceiling, is a non-structural secondary ceiling hung below the structural slab, creating a void that hides wiring, ducts, and fixtures.

Dropping a Han Dynasty Urn

Dropping a Han Dynasty Urn is a 1995 photographic triptych by Ai Weiwei showing him dropping and smashing a 2,000-year-old Han dynasty ceramic urn in Beijing.

Oct 21, 2026

Dropropizine

Dropropizine (UCB 1967, Ditustat, Catabex) is a racemic non-opioid peripheral antitussive, ATC R05DB19, C13H20N2O2, sold as the racemate or as the enantiomer levodropropizine; not available in the United States.

Drops of God (神の雫)

Drops of God (神の雫, Kami no Shizuku) is a Japanese wine manga by Tadashi Agi (Yuko and Shin Kibayashi) and Shu Okimoto, serialized in Morning 2004–2014 in 44 volumes, about Shizuku Kanzaki and Issei Tomine competing to identify twelve Apostles wines; it sold over 15 million copies, moved real wine prices, and spawned a 2009 drama, an Emmy-winning Apple TV+ series, and a 2026 anime.

Drops of God (神の雫) (TV series)

Drops of God (神の雫) is a 2023 French-Japanese-American drama series adapted from the manga by Tadashi Agi, starring Fleur Geffrier and Tomohisa Yamashita, which won a 2024 International Emmy.

Drops of Jupiter

Drops of Jupiter, Train's second studio album (Columbia, March 27, 2001), produced by Brendan O'Brien in Atlanta. Title track written after Pat Monahan's mother's death hit Hot 100 No. 5, won two Grammys, and the album went double platinum.

Drops of Jupiter (Tell Me)

Drops of Jupiter (Tell Me) is Train's 2001 lead single about singer Pat Monahan's late mother, written in 15 minutes after a dream of her in the afterlife. It peaked at No. 5 on the Billboard Hot 100 and won two Grammys.

Dropsonde

A dropsonde is an expendable weather instrument released from aircraft that falls on a parachute, measuring pressure, temperature, humidity, and wind; GPS dropwindsondes have improved tropical cyclone forecasts since 1997.

Dror Grof

Dror Grof is a venture investor and Partner at Team8, a venture group that creates companies in cyber, fintech, and digital health, where he leads the Digital Health Foundry.

Dror Yikra

Dror Yikra (Hebrew: דרור יקרא) is a Sabbath table hymn written in the tenth century by the Hebrew poet and grammarian Dunash ben Labrat, still widely sung.

Drosera

Drosera, the sundews, is a genus of 260 accepted carnivorous plant species with sticky flypaper traps, cosmopolitan in distribution, sister to Dionaea and Aldrovanda, richest in Australia and Brazil, and long used medicinally.

Drosera anglica

Drosera anglica (English sundew, mikinalo) is a circumboreal carnivorous sundew, an allopolyploid hybrid of D. rotundifolia and D. linearis with 2n = 40, native also to Kauaʻi's montane wetlands.

Drosera capensis

Drosera capensis, the Cape sundew, is a perennial carnivorous plant native to South Africa's Cape Provinces. It traps insects with sticky mucilage tentacles, curls its leaf into an outer stomach, digests prey with enzymes, and self-pollinates readily.