also: さんぞく
noun
Refers to an object having three legs, such as a tripod or a three-legged stool. Often used in contexts like 三脚 (tripod) but 三足 can appear in compound words or descriptive phrases.
See also: 三脚
三足の椅子は安定している。
A three-legged chair is stable.
カメラを三足の台に固定した。
I fixed the camera onto a tripod stand.
noun
three pairs
Used when counting items that come in pairs, such as socks, shoes, or chopsticks. 三足 means three pairs, not three individual items.
靴下を三足買った。
I bought three pairs of socks.
この店では靴を三足以上買うと割引になる。
At this shop, you get a discount if you buy three or more pairs of shoes.
Compound of 三 (three) and 足 (leg/foot or counter for pairs of footwear). The reading さんそく is standard; さんぞく is a rare rendaku variant.