鶏冠

/tosːaka/ → /tosaka/

Shift from earlier tossaka (see Etymology 2 below). Now the modern spelling.

The kanji spelling is from keikan (see Etymology 4 below).

• (Tokyo) とさか​ [tòsákáꜜ] (Odaka – [3])[1]
• (Tokyo) とさか [tòsáká] (Heiban – [0])[1]
• IPA^(key): [to̞sa̠ka̠]

鶏冠(とさか) • (tosaka) 

1. a comb, cockscomb (fleshy crest of a rooster)

   Synonyms: 冠 (saka), 肉冠 (nikukan)

2. (colloquial) Short for 鶏冠海苔 (tosaka nori): a species of red algae, Meristotheca papulosa
3. (theater) a kind of wig used in kabuki, with the front hair cut and split apart on the sides; used by onnagata to portray old hags

• 鶏冠(とさか)に来(く)る (tosaka ni kuru, “grow a comb → get angry”)

/tori saka/ → /tosːaka/

Shift from earlier torisaka (see Etymology 3 below).

The kanji spelling is from keikan (see Etymology 4 below).

鶏冠(とっさか) • (tossaka) 

1. (archaic) a comb, cockscomb (fleshy crest of a rooster)

   Synonym: 冠 (saka)

2. (archaic, colloquial) Short for 鶏冠海苔 (tossaka nori): a species of red algae, Meristotheca papulosa

• 鶏冠(とっさか)海苔(のり) (tossaka nori)

Possibly a shift from a compound of 鶏 (tori, “chicken”) +‎ 坂 (saka, “hill”). (Can this⁽⁺⁾ etymology be sourced?)

The kanji spelling is from keikan (see Etymology 4 below).

鶏冠(とりさか) • (torisaka) 

1. (obsolete) a comb, cockscomb (fleshy crest of a rooster)

   Synonym: 冠 (saka)

• 鶏冠(とりさか)海苔(のり) (torisaka nori)

/kei kʷan/ → /keːkan/

Ultimately from Middle Chinese 雞冠 (MC kej kwan).

• (Tokyo) けーかん [kèékáń] (Heiban – [0])[1]
• IPA^(key): [ke̞ːkã̠ɴ]

鶏(けい)冠(かん) • (keikan) ^{←けいくわん (keikwan)?}

1. a comb, cockscomb (fleshy crest of a rooster)
2. (mineralogy, colloquial) Short for 鶏冠石 (keikanseki): realgar

• 鶏(けい)冠(かん)花(か) (keikanka)
• 鶏(けい)冠(かん)山(ざん) (Keikanzan)
• 鶏(けい)冠(かん)石(せき) (keikanseki)

鶏(けい)冠(かん) • (Keikan) 

1. Jiguan (a district of Heilongjiang, China)

• 鶏冠井(かいで) (Kaide)
• 鶏冠木(カエデ) (kaede)