【机】 stress relieving grooving
defend; guard against; prevent
crack; rend; split
【医】 cleavage; cleft; crena; crenae; diastem; diastema; fissura; fissure
gap; rictus; rima; rimae; schistasis; schisto-; schizo-
chamfer; gutter
【计】 slot
【化】 channel
【医】 alvei; alveus; crib; gutter; slot; socket; tank; trough