Usage: 8 forms in 42 verses
Form Translated As     In Verse(s)
αλσών αυτών their sacred groves LXX.Jer.17.2
αλσών sacred groves LXX.1Kgs.18.19
άλσουσ Grove LXX.2Sam.5.24
sacred grove LXX.Judg.6.26LXX.2Kgs.21.7
άλσοσ a sacred LXX.Jer.26.18
a sacred grove LXX.Deut.16.21LXX.2Kgs.17.16
sacred grove LXX.Judg.6.25LXX.Judg.6.28LXX.Judg.6.30LXX.1Kgs.16.33LXX.2Kgs.13.6LXX.2Kgs.23.6LXX.2Kgs.23.15
άλση of their sacred groves LXX.1Kgs.14.15
sacred groves LXX.1Sam.7.3LXX.1Sam.7.4LXX.1Kgs.14.23LXX.2Kgs.17.10LXX.2Kgs.18.4LXX.2Kgs.21.3LXX.2Kgs.23.14LXX.2Chr.14.3LXX.2Chr.17.6LXX.2Chr.19.3LXX.2Chr.31.1LXX.2Chr.33.3LXX.2Chr.33.19LXX.2Chr.34.4LXX.2Chr.34.7LXX.Jer.4.29
their sacred groves LXX.Exod.34.13LXX.Deut.7.5LXX.Deut.12.3
your sacred groves LXX.Mic.5.14
άλσεων sacred groves LXX.2Chr.34.3
άλσεσι sacred groves LXX.Judg.3.7LXX.1Sam.12.10
άλσει her sacred grove LXX.1Kgs.15.13
sacred grove LXX.2Kgs.23.4LXX.2Kgs.23.7

Liddell-Scott-Jones

ἄλσος (alsos) a sacred grove G:N-N

ἄλσος, εος, τό,

grove, [Refs 8th c.BC+]

__II especially sacred grove, [Refs 8th c.BC+]:—hence, any hallowed precinct, even without trees, [Refs 8th c.BC+]; Μαραθώνιον ., of the field of battle, viewed as a holy place, [Refs 4th c.BC+] the ocean-plain, [Refs 5th c.BC+], i.e. alq-ios, cf. Gothic alhs 'temple'.)