俱舍論記 10.165

10.165

「如是段食至分分受之」者，唯欲界繫香、味、觸三，一切皆是段食自體。飢、渴二觸名為食者，消宿食故、希新食故、顯無病故。所以名食，可成段別而飲噉故。謂口能飲噉。鼻能飲，如象等鼻。分分受之，故名段食。此即釋名。又解：謂口飲噉，舌根即分分受味。由鼻飲故，鼻根即分分受香。口、鼻中觸，身根分分受觸。

Regarding 'Such material food [...] consumed piece by piece': The three—odor, taste, and tangibles bound solely to the desire realm—are all entirely the intrinsic nature of material food. The reason hunger and thirst, two tangibles, are called food is that they digest past food, seek new food, and manifest absence of illness. The reason it is called food is that it can be divided into portions and eaten or drunk. That is, the mouth can eat and drink; the nose can drink, as in the trunk of an elephant and the like. Because it is received portion by portion, it is called material food. This explains the name. Another explanation: when the mouth eats and drinks, the tongue faculty receives taste portion by portion; because the nose drinks, the nose faculty receives odor portion by portion; as for the tangibles in the mouth and nose, the body faculty receives tangibles portion by portion.