tròng

• (Hà Nội) IPA^(key): [t͡ɕawŋ͡m˨˩]
• (Huế) IPA^(key): [ʈawŋ͡m˦˩] ~ [ʈɔŋ˦˩]
• (Saigon) IPA^(key): [ʈawŋ͡m˨˩]

From Proto-Vietic *p-lɔːŋ (“iris, pupil”).

tròng • (瞳, 𭿍)

1. eyeball
2. (of eyeglasses) a lens
3. short for tròng đen (“iris”)
4. short for tròng trắng (“sclera”)

Probably originally an affixed form of the root that gave rise to trong (“inside; in”).

(classifier cái) tròng • (㮔, 緟)

1. snare (typically on a long, metal pole)
2. (by extension) ratchet wrench

tròng • (𢫼)

1. to encircle, loop

   tròng chân vào quần ― to put on the trousers (literally, “to make the legs encircled by the trousers”)

(This etymology is missing or incomplete. Please add to it, or discuss it at the Etymology scriptorium.)

tròng

1. small boat, skiff

• “tròng”, in Soha Tra Từ (in Vietnamese), Hanoi: Vietnam Communications Corporation.