赤

vermillion stick; red ink

infrared

last train (of the day)

northern sea nettle (Chrysaora melanaster)

right ascension

blackthroat seaperch (Doederleinia berycoides); rosy seabass

loggerhead turtle (Caretta caretta)

bloodworm (Halla okudai)

red mite (Trombicula akamushi); chigger mite; harvest mite

Abbreviation

Akasaka Prince Hotel

bare feet

Mahjong

red dora; red suited tile that doubles the score of any hand (usu. a five of each suit)

Abbreviation; Medicine

erythrocyte sedimentation rate; ESR

pond slider (Trachemys scripta); red-eared slider turtle

anko-coated mochi (from Ise, Mie pref.)

Matsubara's red rockfish (Sebastes matsubarae)

red river hog (Potamochoerus porcus); bush pig

Colloquial

red sea bream (i.e. the tai, Pagrus major)

Sumo; Food, cooking

fish given to a tournament winner as congratulations

facial gesture of pulling one's eyelid down and sticking out one's tongue

Computing

red-black tree; self-balancing binary search tree

red-rumped swallow (Hirundo daurica)

striated swallow (Hirundo striolata)

brown bear (esp. the Ussuri brown bear, Ursus arctos lasiotus)

Word usually written using kana alone

Matsubara's red rockfish (Sebastes matsubarae)

Food, cooking; Kantou-ben

red rockfish; red scorpionfish

red stingray (Dasyatis akajei)

vivid crimson