芥け子し粒つぶ

noun

poppy seed

Literal meaning: the small seed of the poppy plant, used in cooking and baking.

See also: けしの実

• このパンには芥け子し粒つぶがたくさん入はいっている。

  This bread has a lot of poppy seeds in it.

noun

something extremely tiny

Figurative use, often in comparisons with ほど or のよう, emphasizing extreme smallness.

• 彼かれの心こころは芥け子し粒つぶほどもない。

  He has not even a poppy seed's worth of heart (i.e., he is utterly heartless).