口

regular production; present model

(of Chinese) pronunciation of kanji without a medial between the initial consonant and center vowel

(of Japanese) the long "o" vowel arising from combination of the "a" and "u" sounds

(of Chinese) pronunciation of kanji with a medial between the initial consonant and center vowel

(of Japanese) the long "o" vowel arising from combination of the "o" and "u" or "e" and "u" sounds

diffuser; air supply outlet in air-conditioning system

vignetting

aperture ratio (inverse of the f-number); relative aperture

coin return slot; change slot

mustached monkey (Cercopithecus cephus); moustached guenon

water supply pipe inlet/outlet (esp. on standpipes and dry risers)

endorheic lake; closed lake

Merostomata (group comprising the sea scorpions and the horseshoe crabs)

Grammar

word form used in vernacular language (as opposed to classical language)

Thorold's deer (Cervus albirostris); white-lipped deer

oral fluid

Linguistics

palatalization

Mahjong

winning hand composed of two sets of two identical chows plus a pair

exorheic lake; open lake

extra-thin (paper, etc.)

extra-thick (paper, etc.)

Slang; Abbreviation

lip piercing

futakuchi-onna; two-mouthed woman; folklore monster that takes the form of a woman with an additional mouth on the back of her head, hidden underneath her hair

Medicine

oral slit; oral fissure; rima oris

Biology

cytostome

Biology

cytostome

admission gate; entrance gate; entrance