- Orthographic/Phonemic: รัก
- Sequence of characters: r+a+k
- Paiboon: rák
- (Bangkok) IPA(key): /rak̚˦˥/
From a Mon-Khmer language; ultimately from Proto-Mon-Khmer *r[a]k (“to love; beloved, dear”). Cognate with Lao ຮັກ (hak), Northern Thai ᩁᩢ᩠ᨠ (hak) and Shan ႁၵ်ႉ (hak5, “to love”). Outside Tai-Kadai, cognate with Khmer រាក់ (reak, “friendly, cordial, pleasant; intimate, affectionate”), as in រាក់ទាក់ (reak-teak, “friendly, warm, pleasant”). The Proto-Mon-Khmer root possibly represents an allofam of the proto-root *mr[a]k, *rmr[a]k (compare Proto-Mon-Khmer *ma[a]k, *mak (“to like, love”)), whence Khmer ម្រក់ (mrɛ̀ek, “girl's friend of same sex, man's friend's wife”), and possibly Thai มลัก (má lák, “to love, to like”).
- the plant Calotropis gigantea (L.) Aiton f. of the family Asclepiadaceae, commonly known in English as crown flower.