(physics) infrasound

dam / prevent / stop up

(formal) dear sirs, Messrs. (form of address used in formal letters, placed after the name of the organization to address members of that organization)

diaeresis

(orthography) the sort order for kana (historically, mainly for katakana) as arranged in the 五十音図 (literally “table of the fifty sounds”)

(phonology, orthography, grammar) all Japanese morae that can be spelled with 45 single modern kana and 2 historical kana (ゐ/ヰ and ゑ/ヱ) customarily without diacritical marks (゛ and ゜), excluding っ and ん, arranged in a 5x10 table (五十音図 (gojūonzu, literally “table of the fifty sounds”)), used for phonological and grammatical analysis

(phonetics) International Phonetic Alphabet

music therapy

heat therapy

one who is bad at athletics, one who has poor athletics skill