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1) [line 7] SHEMONEH METZUMTZAMOS - exactly eight Amos wide (see Insights)
2) [line 8] NESER U'PESAL - a board [four Tefachim wide] and kosher Sechach [four Tefachim wide]

*3*) [line 12] U'MI'ATO - he diminished the empty space by filling in either part of it or all of it

*4*) [line 16] YESH LAVUD BA'EMTZA - the Halachah l'Moshe mi'Sinai of Lavud (see Background to Sukah 14:9) applies not only to gaps at the edge of the Sechach, but also to those in the middle of the Sechach. Even if only a very narrow strip is not covered with Sechach it can invalidate the Sukah, if it runs from one end of the Sukah to the other and divides the Sukah into sections that no longer have the minimal Shi'ur for a Sukah -- 7 by 7 Tefachim and three walls. (TOSFOS)

5) [line 25] ARUBAH - a skylight
6) [line 34] REBBI, PARISH! - My teacher, explain your words!
7) [line 36] AVRUMA - a type of very small fish
8) [line 40] TZACHANTA - a type of small fish that is preserved in brine
9) [line 40] BAV NAHARA - the Bav River, a tributary or a canal of the Euphrates
10) [line 41] D'REDIFEI MAYA - the water flows swiftly
11) [line 42] LO MATZI KA'IM - it cannot survive
12) [line 44] KILFEI - scales
13) [line 46] D'LO MARBEH TINAIHU DAG TAMEI - non-Kosher fish do not breed in their mud
14) [line 47] NAHAR EISAN - the Eisan River
b) [line 47] NAHAR GAMDA - Gamda River, the name of a river or canal in Bavel
15) [line 48] ACHSADRAH SHE'YESH LAH PETZIMIN - a covered area in front of a house (e.g. in a courtyard) that is open on at least one side, and that has posts holding up the roof of the Achsadrah. The spaces between the posts are less that three Tefachim wide.

16) [line 1] PI TIKRAH YORED V'SOSEM - (The edge of a roof beam descends and encloses)
(a) The Torah requires Mechitzos (partitions) for various Halachos (e.g. for Reshus ha'YachidQ of Shabbos and for Sukah). A Mechitzah must be ten Tefachim high and enclose an area of four by four Tefachim.
(b) When an area is covered by a roof, a Halachah l'Moshe mi'Sinai states that the edge "descends and encloses," even though that side is completely open and has no physical partition. We may consider the area enclosed for Halachic purposes (see Insights to Eruvin 25:2).

17) [line 5] K'MAVOY HA'MEFULASH - like a Mavoy (alleyway) that is open on both ends
18a) [line 7] ACHSADRAH B'VIK'AH - (a) an area in a field that is covered with a roof but is open on all four sides (RASHI); (b) an area in a field that is covered with a roof and is closed on two or three of its sides (TOSFOS). Rav and Shmuel argue as to how many of the four sides of an Achsadrah may be enclosed by using Pi Tikrah (see Insights to Eruvin 25:2 and here).
b) [line 14] BIK'AH - a plain of open fields

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