龜頭 [龟头]

Jyutping gwai1 tau4
Pinyin guī tóu

Definitions (CC-CEDICT)
  1. head of a turtle
  2. glans penis
Definitions (粵典–words.hk)
  1. 名詞
    陽具​（​陰莖​）​嘅​頂​端​（​量​詞​：​個​）
    the tip of the penis, the head of the penis; glans; literally, turtle head
Definitions (Wiktionary)
  1. noun
    glans penis
  2. noun
    head of a tortoise or turtle
Definitions (Kaifangcidian)
  1. （沒有對應漢語詞彙）