An Etymological Dictionary of Astronomy and Astrophysics

1. Below the average or expected degree, amount, or intensity. Having or containing a relatively small amount.
   

2. Situated, placed, or occurring not far above the ground, floor, or base. Relatively little in height.

Etymology (EN): From M.E. lah, from O.N. lagr “low,” from P.Gmc. *lægaz (cf. O.Fris. lech, Du. laag, Ger. läge “low”), literally “that which is lying flat;” related to E. lie (v.).

Etymology (PE): Kam “little, few; deficient, wanting; scarce,” from Mid.Pers. kam “little, small, few,” O.Pers./Av. kamna- “small, few.”
Keh “small, little, slender” (related to kâstan, kâhidan “to decrease, lessen, diminish,” from Mid.Pers. kâhitan, kâstan, kâhênitan “to decrease, diminish, lessen;” Av. kasu- “small, little;” Proto-Iranian *kas- “to be small, diminish, lessen”); kutâh, → small; pâyin, → bottom-up structure.