Where does “läksynluku” come from?

läksynluku (Finnish) comes from Finnish läksy, from Swedish läxa, from Middle Low German lexe, from Old Saxon lekzia, from Latin lēctiō, from Latin -tiō, from Latin dissertātiō, from Latin dissertus — small stone, pebble; gravel, rubble.

Ancestry of “läksynluku”, step by step

läksynluku traces back through two separate lines of ancestry.

via Finnish läksy

StepLanguageWordMeaning
1Finnishläksyhomework school exercise set by a teacher often used in the plural, especially as an object with verbs
2Swedishläxahomework; lesson
3Middle Low Germanlexe
4Old Saxonlekzia
5LatinlēctiōA picking, selecting
6Latin-tiōtion, -ation, -ing
7Latindissertātiō(spoken) dissertation, discourse, disquisition
8Latindissertusarranged, disposed; explained
9Latindissereresecond-person singular future passive indicative...
10Latindis-asunder, apart, in two; reversal, removal;...
11Latincalceusshoe
12Latincalxlimestone; chalk; the finish line
13Ancient Greekχάλιξsmall stone, pebble; gravel, rubble

via Finnish luku

StepLanguageWordMeaning
1Finnishlukunumber, count, quantity; chapter; reading
2Proto-Finniclukunumber, quantity
3Proto-Finniclukedakto count; to read ?
4Proto-Uralicluke-to count
Every word from Ancient Greek χάλιξEvery word from Latin -tiōEvery word from Latin dis-